Peak day
Peak days are dates of very high demand on which operators and jet card programmes apply surcharges, longer notice requirements or restrictions on cancellations. Typical US peak periods are Thanksgiving week, Christmas and New Year, Presidents' Day weekend, spring break and the Fourth of July; in Europe they include Christmas, February school holidays, Easter, the Monaco Grand Prix and August in the Mediterranean; in the Gulf, Eid and the winter season. Jet cards often list 30–60 peak days a year with surcharges of 10–40% and require booking a week or more ahead. Ad hoc charter prices on those days can be double the normal rate, and aircraft may simply be unavailable.