Yes, you can use all EF
lenses on the Rebel XT
as well as Canon's EF
-S lenses that are made for crop digital SLRs. You can also use all 3rd party lenses (Sigma, Tamron etc.) although I think some of them might need to be re-chiped.
Because the sensor of the Rebel XT
is smaller than the frame covered by 35mm film, you will get the impression that your lenses have more zoom. For example, your 28mm lense will not be as wide as it was with your film camera but for aviation this is more of an advantage than a disadvantage.
I think that vingetting is more of a problem with full-frame DSLRs because the cropped sensor ones do not use the edges of the circle image that lenses produce. Even if there is vingetting, it will be negligible.