The private aviation glossary
104 terms explained in plain English — from ACMI to wet lease.
B
Baggage (external / internal) aircraft
Business jets carry luggage either in an external hold reached from outside the aircraft, or in an internal compartment accessible in flight, or both. External holds on light and midsize jets are typically 50–80 cubic feet and take roughly one medium suitcase and a carry-on per passenger; oddly shaped items like golf bags, skis and bicycles may not fit even if the volume is available, because the hold door is small. Large-cabin jets have walk-in baggage areas of 150–200 cubic feet. Weight limits also apply, and a full cabin plus heavy bags can force a fuel stop. Send your operator the number and size of bags in advance, and mention anything unusual.
Balanced field length aircraft
Balanced field length is the runway needed for an aircraft, at a given weight and temperature, to either continue a take-off safely after an engine failure at the critical decision speed or stop on the remaining runway. It is the figure that decides which airports an aircraft can use with a full load: a Citation CJ3+ needs about 3,200 ft, a Challenger 350 about 4,800 ft and a Gulfstream G650 around 6,000 ft at sea level on a standard day. Heat, altitude and weight push the requirement up sharply, so a jet that works at London Biggin Hill in April may need a lighter load at Aspen or Kathmandu in July.
Bizliner aircraft
A bizliner is an airliner converted into a private aircraft: the Boeing Business Jet (BBJ) based on the 737, the Airbus ACJ319/320neo family and, at the top, widebody 787 and A350 conversions. Cabins of 800–1,000 square feet or more accommodate bedrooms, showers, conference rooms and 18–50 passengers, with ranges of 6,000–7,000 nautical miles. They serve heads of state, royal families, corporations moving whole delegations and tour groups, at charter rates of $18,000–$30,000 an hour plus much higher airport fees. Their weight also restricts them to larger airports and they are less flexible on slots and parking than a purpose-built business jet.
C
Cabin altitude aircraft
Cabin altitude is the effective altitude of the air inside a pressurised aircraft while it cruises much higher. Airliners typically hold the cabin at 6,000–8,000 ft; modern business jets do better, with the Gulfstream G700 and Bombardier Global 7500 keeping the cabin near 3,000–4,500 ft at cruise, and Falcons and Citations in the 4,000–6,000 ft band. A lower cabin altitude means more oxygen in the blood, less fatigue, headache and dehydration and a real reduction in jet lag on long flights. It is one of the least visible but most valuable comfort features when comparing aircraft, and it matters most for elderly passengers and anyone with heart or lung conditions.
Cabin volume aircraft
Cabin volume is the interior space of the passenger cabin in cubic feet or metres, and it is a better guide to comfort than seat count. A very light jet has around 200 cubic feet, a light jet 300–400, a midsize 500–600, a super-midsize 700–900, a large-cabin jet 1,200–2,000 and an ultra-long-range aircraft over 2,500. Cabin height and width matter as much as length: a 6 ft flat-floor cabin transforms a five-hour flight compared with a 4 ft 9 in cabin with a dropped aisle. Manufacturers and operators sometimes quote maximum seats that assume every belted seat, including lavatory and divan positions, is used; ask what is comfortable for your group.
Cycle aircraft
A cycle is one take-off and landing, and for many components it matters more than flight hours. Landing gear, pressurised fuselage structures, engine discs and brakes are life-limited in cycles because the stress of pressurisation, landing loads and engine spool-up occurs once per flight regardless of length. An aircraft flown on many short hops accumulates cycles quickly: 4,000 hours and 4,000 cycles points to a hard-worked short-haul life, while 4,000 hours and 1,500 cycles suggests long sectors and gentler use. Buyers and appraisers look at the hours-to-cycles ratio, and some inspections and engine programme charges are billed per cycle rather than per hour.
D
Dispatch reliability aircraft
Dispatch reliability is the percentage of scheduled departures an aircraft type or fleet makes on time without a technical delay or cancellation. Manufacturers quote figures above 99% for mature types; the Gulfstream and Falcon fleets and the Citation family have long records near 99.8%. For a charter customer, the operator's own reliability record matters more than the type's: ask how often flights are moved to a substitute aircraft and what the recovery plan is if the jet goes technical at an outstation. For an owner, dispatch reliability drives how often you end up chartering a backup, which is a hidden but real cost of owning a single aircraft.
E
eVTOL aircraft
Electric vertical take-off and landing aircraft are battery-powered vehicles with multiple rotors that lift like a helicopter and, in most designs, cruise on wings. Companies such as Joby, Archer, Beta, Vertical Aerospace and China's EHang are certifying them for four- to six-seat air taxi services over ranges of 50–150 miles, with the first commercial passenger flights beginning in Dubai, Abu Dhabi and parts of the US and China. For private aviation, the near-term role is the airport transfer: a ten-minute hop from a city vertiport to the FBO. Expect early fares comparable to a helicopter charter and real capacity constraints for several years.
L
Large-cabin jet aircraft
Large-cabin, or heavy, jets seat ten to sixteen in cabins with multiple zones, full galleys with hot food, often a divan that converts to a bed and sometimes a private stateroom, with ranges from 3,800 to 6,000 nautical miles. The Gulfstream G450/G500, Bombardier Challenger 650 and Global 5500, Dassault Falcon 900 and 7X, and Embraer Legacy 650 are representative. Charter rates run $9,500–$13,500 an hour. They are the aircraft for transatlantic and transcontinental trips with a full group, or any flight where cabin space and crew service matter more than the price, and they typically carry a cabin attendant.
Lavatory (enclosed / belted) aircraft
Business jet lavatories range from a curtained emergency seat with a toilet beneath the cushion in very light jets, through fully enclosed lavatories with solid doors and a sink in light and midsize aircraft, to large-cabin jets with two lavatories and, on ultra-long-range aircraft and bizliners, a shower. Many lavatory seats are certified as belted seats, which is how a six-seat jet can be marketed as seven seats; sitting on one for a flight is legal but not pleasant. For flights over 90 minutes, or with children, older passengers or anyone who values privacy, an enclosed lavatory is worth asking about specifically, and some very light jets have none at all.
Light jet aircraft
Light jets seat six to eight, cruise at 400–450 knots and have ranges of 1,400–2,000 nautical miles, enough for London–Athens, New York–Miami or Dubai–Mumbai non-stop with a light load. Typical types are the Cessna Citation CJ3+ and CJ4, Embraer Phenom 300, Learjet 75 and Pilatus PC-24. Charter rates run $4,500–$6,000 an hour. Cabins are around 4 ft 9 in high, so most adults stoop, and there is usually a proper enclosed or curtained lavatory and 60–80 cubic feet of baggage space. This is the workhorse category for one- to three-hour flights and the best value for small groups.
M
Mach number aircraft
Mach number expresses an aircraft's speed as a fraction of the speed of sound at its altitude. Most business jets cruise between Mach 0.75 and 0.85; the Citation X+ and Gulfstream G650/G700 can reach Mach 0.925 to 0.935, the fastest civil aircraft flying today. Because fuel burn rises sharply near an aircraft's maximum Mach, operators usually plan long flights at a slower long-range cruise speed. For a passenger the difference between Mach 0.80 and 0.90 on a New York to London flight is about 30 minutes; on a one-hour hop it is negligible, so pay for speed only when the sector is long enough to feel it.
Midsize jet aircraft
Midsize jets seat seven to nine in cabins tall enough for most people to stand, with an enclosed lavatory, a real galley and ranges of 2,000–2,800 nautical miles: the Citation Latitude and XLS+, Learjet 60, Hawker 800/900 and Embraer Praetor 500 are typical. They are the sweet spot for three- to five-hour flights such as New York to Los Angeles with a stop, London to Marrakech or Singapore to Hong Kong, at charter rates of $6,000–$8,000 an hour. Compared with a light jet the extra cost buys standing headroom, more luggage and quieter, more comfortable long sectors, which is why midsize aircraft are the most common charter choice for business travel.
MLW (maximum landing weight) aircraft
Maximum landing weight is the heaviest an aircraft may be when it touches down, set by the strength of the landing gear and structure to absorb the impact. It is lower than the maximum take-off weight, so an aircraft that departs full of fuel for a long flight and then has to return shortly after take-off may need to burn or dump fuel before it can land. For charter customers the MLW matters mainly on short flights with heavy loads: a jet fuelled for a long onward sector cannot always accept a full cabin and full baggage on a 30-minute hop, and the crew may ask to reduce bags or add a fuel stop.
MTOW (maximum take-off weight) aircraft
Maximum take-off weight is the heaviest an aircraft is certified to be when it begins its take-off roll, including fuel, passengers, baggage and the airframe itself. It sets the ceiling on the trade-off between how far a jet can fly and how much it can carry, and it drives a surprising number of fees: landing charges, navigation fees and handling are often priced per tonne of MTOW, and thresholds such as 12,500 lb (5,700 kg) determine which security, pilot and airport rules apply. A Phenom 300 has an MTOW of about 18,400 lb; a Global 7500 about 114,850 lb, which is why a large-cabin jet's airport bill is a multiple of a light jet's.
P
Payload-range trade-off aircraft
The payload-range trade-off is the rule that the more weight an aircraft carries in people and bags, the less fuel it can lift and the shorter it can fly. Manufacturers quote maximum range with a light load, so a light jet advertised at 2,000 nautical miles might manage 1,500 with six people and skis, and a midsize jet that can cross the Atlantic with four passengers may need a Gander or Shannon stop with eight. Headwinds and hot, high airports make it worse. When choosing an aircraft, tell the operator the true passenger count and baggage and ask them to confirm non-stop capability, rather than relying on the type's brochure range.
S
Service ceiling aircraft
Service ceiling is the maximum altitude at which an aircraft can still climb at a small, defined rate, in practice the highest cruising level it is certified to use. Most business jets are certified to 41,000–45,000 ft and the Gulfstream, Global, Falcon and Citation X families to 51,000 ft, well above the 35,000–41,000 ft where airliners cruise. Flying higher puts business jets above most weather and airline traffic, gives a smoother ride and more direct routings, and improves fuel efficiency. The trade-off is a stronger pressurisation system, which is why high-ceiling aircraft often also offer a lower cabin altitude.
Super-midsize jet aircraft
Super-midsize jets bridge the gap between midsize and large-cabin aircraft: eight to ten seats, a wider stand-up cabin with a flat floor, and transcontinental range of 3,000–3,600 nautical miles. The Bombardier Challenger 350/3500, Cessna Citation Longitude and Sovereign, Gulfstream G280, Embraer Praetor 600 and Dassault Falcon 2000 series define the category. They fly New York–Los Angeles non-stop, London–Dubai and, with a favourable wind, the North Atlantic westbound, at charter rates of $7,500–$10,000 an hour. For many customers they are the rational choice for four- to six-hour flights, offering most of the comfort of a large-cabin jet at 25–35% lower cost.
T
Turboprop aircraft
A turboprop is an aircraft powered by a jet turbine driving a propeller, such as the Pilatus PC-12, Beechcraft King Air, Daher TBM and Piaggio Avanti. Turboprops fly slower than jets, roughly 260–320 knots against 400–500, and lower, so they are best on sectors under 500 miles, where the time penalty is 15–30 minutes. Their advantages are cost, with charter rates of $2,800–$3,800 an hour, and access: they can use short, unpaved or high-altitude strips that jets cannot, and they burn a third less fuel. A PC-12 is often the smartest choice for a family with luggage flying to a ski resort or an island.
U
Ultra-long-range jet aircraft
Ultra-long-range jets are the flagships of the business fleet, able to fly 6,500–8,000 nautical miles non-stop, meaning New York–Tokyo, London–Sydney with a single stop or Dubai–Los Angeles direct: the Gulfstream G650ER, G700 and G800, Bombardier Global 7500 and 8000, and Dassault Falcon 8X and 10X. They combine a large three- or four-zone cabin with a very low cabin altitude, fast Mach 0.85–0.925 cruise and modern Ka-band connectivity. Charter rates are $12,000–$17,000 an hour and availability is thinner than in smaller categories, so they should be booked well ahead. Below about eight hours' flight time they are rarely worth the premium over a large-cabin jet.
Useful load aircraft
Useful load is the difference between an aircraft's empty weight and its maximum take-off weight: the total it can carry in fuel, people and baggage combined. Because fuel is part of it, a jet cannot have both full tanks and a full cabin on many types; the marketing brochure's range figure usually assumes only four passengers. As a rough guide count 200 lb (90 kg) per adult with a bag, so eight passengers with luggage is about 1,600 lb that comes straight off the fuel available. When an operator says a particular aircraft cannot do your trip non-stop with your group, this is the number they are looking at.
V
VLJ (very light jet) aircraft
Very light jets are the smallest jets, weighing under about 10,000 lb, seating four to six and often certified for a single pilot: the Cirrus Vision Jet, Embraer Phenom 100, Cessna Citation Mustang and M2, and HondaJet. They cruise at 340–420 knots over ranges of 1,000–1,400 nautical miles, cost $2,000–$3,500 an hour to charter and can use runways under 3,500 ft, which opens up many small airports. The cabins are compact, with limited headroom, an unenclosed or emergency-only lavatory and little baggage space, so they suit one- to two-hour flights for two to four people rather than families with luggage.
W
Wi-Fi (Ka / Ku band) aircraft
Inflight internet on business jets comes in tiers. Air-to-ground systems such as Gogo work only over the continental US and parts of Europe at modest speeds. Satellite systems using Ku-band or, better, Ka-band (Viasat, Inmarsat Jet ConneX) offer 15–50 Mbps worldwide except near the poles, enough for video calls and streaming, and are standard on large-cabin and ultra-long-range aircraft. Low-earth-orbit services from Starlink are now being installed on everything from Citations to Globals, delivering 100 Mbps or more with lower latency. Data on satellite systems is expensive; some operators include it, others charge $5–$15 per megabyte or a flat fee per flight, so ask.