AIM Text
- Pilots departing on an IFR flight plan should consult the Chart Supplement to determine the frequency or telephone number to use to contact clearance delivery. On initial contact, pilots should advise that the flight is IFR and state the departure and destination airports.
- Air traffic facilities providing clearance delivery services via telephone will have their telephone number published in the Chart Supplement of that airport's entry. This same section may also contain a telephone number to use for cancellation of an IFR flight plan after landing.
- Except in Alaska, pilots of MEDEVAC flights may obtain a clearance by calling 1-877-543-4733.
Source: FAA Aeronautical Information Manual · current edition · paragraph 5-2-3.
Research Notes
AIM 5-2-3 covers Issuance of Pre-Departure Clearances — the ATC-side procedures for issuing IFR clearances before pushback or taxi.
The two delivery methods:
- Voice (most common for GA): Clearance Delivery issues clearance via radio
- ACARS/PDC (airline/business aviation): Clearance arrives as data message
Standard delivery timing: Pre-departure clearances are typically issued 10-30 minutes before scheduled departure. Earlier is fine if requested.
Reference: AIM 5-2-3.