Custom and bad. The font was probably optima. I had a bit of spare time and modified it below in an eps that should be close enough for a flight sim. Only took 5 mins to ruin :-)

This for the tail

pegasus.eps (121.8 k)

Optima lacks the little tentative serifs of the Pegasus logo.

The font I used is called Optima by Herman Zapf.
The registration font is likely not something you can get digitally. They look very constructed to me. You could buy fonts that would get you close (Interstate caps or FF DIN caps) but it's probably just as good to use plain old Arial.

You must have the flight sim bug pretty bad!

Edit:
Patricia, agreed. I seriously doubt the author of that logo was working from an actual font due to the general lack of basic modulation cohesion.

You could also use Eurostile for the registration, it has the same squared-off look.

http://www.myfonts.com/fonts/linotype/eurostile/eurostile/testdrive.html?s=TC-APR&p=72

Selcuk, how do you go about painting the plane? Do you have templates for the different types of planes? I'm asking because I need to devise paintjobs for commercial airplanes as part of a school assignment.. Having templates I could put into Illustrator would make the job a lot easier.

For the registration lettering, might want to check out B-52 from Radar Design or SAA from URW (I would recommend SAA over Interstate for this purpose -- half the price per weight and actually closer to the authentic lettering of the FHWA).

I just found this site�Selcuk, you might find these fonts useful:

Amarillo USAF Fonts