Fuel surcharge
A fuel surcharge is an amount added to the base hourly rate to pass on fuel costs above a reference price written into the contract. It is common in jet card and fractional contracts, where the hourly rate is fixed for years, and appears in some ad hoc charter quotes when prices spike. Surcharges are typically expressed as dollars per flight hour for each cent that jet fuel rises above a benchmark, and they can add 10–20% in a volatile year. Ask whether a quote is inclusive of fuel and, for a card, what the reference price is and how often it is reset; fixed all-in pricing is worth paying a small premium for.