Angel Flight call signs

Doug Carter wrote:

Michelle P wrote:
Doug,
Since the was Airlifeline, Angel Flight Mid-atlantic, Southest, West,
Lifeline pilots..... They all used different Call signs or none at all.
The organizations got together in late 1990s...

I did some more searching and found that the "Air Care Alliance" got the
FAA to accept the "Compassion" call sign in May of 1999 (see:
http://www.aircareall.org/callsign.htm#cmpsn-procedures)

Wow it looks like the author of that letter didn't read his own letter.
First it describes what three letter designators are required for, and then
it claims that American Airlines would file AA 1234 for its flight 1234 and
British Airways would file BA for its flight 4321. Actually they would file
AAL1234 and BAW4321 respectively. Those two letter codes are IATA's and used
for passenger scheduling, ticketing, etc, not for flight plans.