They are designed to lessen the impact of crashes with minor injuries. Dependent on an airline's choice of installation, airplane airbags are most often installed in First class, Business class, Premium Economy, and Economy bulkhead/exit row seats.
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They're all close, but the exact one is going to be more-or-less matched to a type of seat and the airline. If you need a longer belt, there should be several extensions* on board (you can't legally use more than one for a particular seat, but there are usually enough for several passengers).
However, statistically speaking, a seat close to an exit in the front or rear, or a middle seat in the back third of the plane offers the lowest fatality rate.
Although the question we can ask is; Is there a seat that can keep them the safest in the event of a crash? Aviation specialist Doug Drury from Central Queensland University has analysed different seating options and has concluded that the middle seat is the safest option in the case of a plane crash.
You should be fine. You could try and google the largest seat in your class category and try to book it. You will be fine, you probably won't even need an extender on your belt. A size 22 won't have difficulty fitting in a airline seat, and doing up the seat belt.
I am a bigger person, size 24-26-28. Will I fit in an airplane seat? You will probably need to buy two coach seats and ask for a seatbelt extender (or to have yours). Remember, two coach seats are generally much cheaper and more spacious than a single first class seat.
If you can buckle your seatbelts, you guys should be able to fly without any issue. If the seatbelts don't fit, you should contact whichever airlines you're considering and confirm whether or not they will offer a seatbelt extender.