>Airplanes shouldn't get a higher safety rating simply because the trips are 100x longer on average.

Note that you can take those stats and multiply by how many miles you're traveling to figure out your per-incident risk (ie. risk for the whole flight). Even if you do that you'll find they're quite safe, compared to other activities you do every day. Sure, the averages might not be applicable for edge cases (eg. very short flights), but for the average traveler it's a pretty good estimate.