Opening hours
Tower and airport-run FBO 06:00–22:00 (15 May–30 Sep) and 06:00–21:00 (1 Oct–14 May). Boston Approach outside those hours.
Curfew
APU use is limited to 15 minutes. Runway 6/24 is 6,303 × 150 ft; Runway 6 landing distance is 5,765 ft after a 538 ft displaced threshold. Runway 24 landing distance is 6,303 ft. Runway 15/33 is 4,500 × 100 ft. ILS approaches serve both ends of 6/24.
Slots
No coordination — No slot coordination. Unscheduled operations with more than nine passenger seats need 2 hours' prior permission from the airport manager. Summer ramp space should be confirmed in advance.
Customs
No customs (domestic only) — ACK has no U.S. Customs and is not on CBP's general aviation airport list. International arrivals clear first at Boston Logan (BOS), Hanscom Field (BED) or Hyannis (HYA, landing rights), then continue as a domestic flight.
VIP terminal
Dedicated FBO / VIP terminal — The Town of Nantucket operates the only FBO. There is no Signature or Atlantic.
Peak note
Ramp space is limited. Sunday afternoon departures are commonly delayed in summer.