FAA continues to publish ATC telephone numbers for pilots who need to get an IFR clearance or close an IFR flight plan at non-towered airports (background here at BruceAir).
Leidos FSS has posted ARTCC clearance/cancelation phone numbers on its website, here.
Note that FAA is testing a system that would allow pilots to receive ATC clearances on mobile devices. For more information, see this article at AOPA.
- Chart Supplement (A/FD) entries for 656 airports have been updated with clearance delivery phone numbers.
- 25 additional approach control facilities will participate in the program; the Chart Supplement entries for over 200 additional airports will be updated to include a clearance delivery phone number.
- For all other uncontrolled airports without a GCO or radio outlet linking them to ATC or Flight Service, pilots will be able to obtain a clearance by calling the overlying ARTCC.
The September 2018 update to the AIM will include the following paragraph:
5-2-3. TAXI CLEARANCE
a. Pilots departing on an IFR flight plan should consult the Chart Supplement US airport/facility directory to determine the frequency or telephone number to use to contact clearance delivery. On initial contact pilots should advise the flight is IFR and state the destination airport.