It would be an idea to create a photo thread in the PHOTOGRAPHY forum so you can post your progress there. Only upload planes that are closer to FILLING the FRAME and only the SHARPEST shots you get.
Find out if your camera has SPEED and APERTURE settings, but again you never told us which model camera you have.
I shot with 100 for 20 years, not a single blurry airplane. You have to have the settings right in your camera though.
A point & shoot camera can be loaded with 100 iso film to shoot static shots, other than that 100 is too slow to shoot action with such a camera.
Nowadays I wouldn't trust those 1-hour places for developing to see the true results, I'd take them to a professional lab. If I had a film scanner I'd be shooting print film instead of digital. It's possible Kodak might have changed the emulsion but the Kodak Gold back in the 90s gave me some stunning prints, images had much more "pop" than digital to my eyes.