A human eye sees the equivalent of around about 50mm - not an exact number, but not too far off (actually its nearer 55mm, but what the heck!).
A lens with anything less than 50mm gives a wider view than the human eye sees, anything more than 50mm gives a zoomed in or "closer" view in the resulting photo.
So, a 28-100 gives a full frame image from almost twice as wide as the view an eye takes in at 28mm, to half of what it takes in (i.e. the centre half of what you see with your eyes will fill the frame) at 100mm. A 38-135 lens doesn't take in such a wide view at the 38mm end and zooms in closer at the top end than a 100mm lens.
Wide angles (anything below 50mm) are good for static airplanes at airshows and not much else, 50mm exactly is the classic side-on ramp shot lens, but for decent pics at airports where you're away from the action the longer the better, although neither 100mm nor 135mm is likely to be long enough to shoot from the average location at an average airport - these need 200mm plus at least.
There are old pilots and there are bold pilots, but there are no old bold pilots