OPNLguy From , joined Dec 1969, posts, RR:
Reply 1, posted (9 years 6 months 1 week 16 hours ago) and read 6864 times:
The H/ prefix is to denote to the ATC folks that the aircraft is a "heavy" for wake turbulence purposes, and increase separation for any aircraft behind it. The B744 and B753 should also carry this, although the B752 may or may not, depending upon if it's a high-weight version that puts it over the 255,000 lb threshold for the "heavy" designation. It's a moot point, in a sense, since ATC (here in USA, can speak for elsewhere) treats -all- 757s as if they were "heavy" for wake. turbulence separation purposes.
The various /Q suffix and other examples tell ATC what kind of nav equipment the aircraft has onboard. A new table went into effect on 9/1/2005:
Goldenshield From United States of America, joined Jan 2001, 6138 posts, RR: 14
Reply 2, posted (9 years 6 months 1 week 15 hours ago) and read 6853 times:
We still file with T/, even though I've heard from various FSS people that it is no longer required. I'm not sure on their reasoning on this, but I comply, so whenever I have to manually file a flight, I just drop the T/.
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