gives the data for CFM56 engines.
For instance a 22k CFM56-5B5 (very common on A319s) will deliver max 5,020 lbs at FL350.
Other versions, e.g. the -5B4 and -5B6 with 27k and 23.5k TO
thrust, have the same max 5,020 lbs at FL350. I would guess that the -5B5 and -5B6 are basically identical to the -5B4, but with derated TO
thrust for longer on wing time and reduced maintenance requirements.
So there is not a direct relationship between max thrust and ambient air density. But it is pretty close.
BTW, did you know that the max thrust of a P&W J-75 in a Lockheed U-2R
way up in coffin corner is just some 700-800 lbs?
[Edited 2004-10-22 00:29:11]
[Edited 2004-10-22 00:30:11]
[Edited 2004-10-22 00:31:04]