Before I retired the times were a site parameter. They were established at
the Center after coordination with the terminal facility. Once you file
them they are in the Centers computer (what we used to call temporary
storage) they could be called up from there by the departure facility. The
busier the Center and terminal facility the shorter the time.
Al

"John R. Copeland" wrote in message
...
It says "a minimum of 1 hour after the proposed departure time."
Every place I've ever inquired, they've told me I get two hours.
---JRC---

"Ali Ghorashi" wrote in message
...
I think the AIM (see 5-1-11) says that flight plans will stay in the ATC
computer 1 hour after departure. Also, AIM paragraph 5-1-7 says that: "
Pilots should file IFR flight plans at least 30 minutes prior to estimated
time of departure to preclude possible delay in receiving a departure
clearance from ATC.".

There's a lot of good information in that "little" book.

-Ali

"PaulH" wrote in message
om...
If I file an IFR flight plan 2 hours in advance from departure from a
towered airport and then leave really early or really late:
1. Is the FP normally available to my local tower about half an hour
after filing?
2. How long does it remain in the "system" if I get delayed?