Uhhh - Johnny come lately here - I guess you found out in the decade since you asked about aviators' favorite fly-aboard personal sidearm (hard to say it and not start laughing)... So: No way. Or, in the vernacular: "No chance, paddles" -
Either you had to be sarcastic, else you were quite the greenhorned newb to ask it back then... And while this is an ancient thread, the question was so.. ludicrous - after a quarter century flying military, I had to say something that only a few others seemed to get. Just to get it down in case someone else stumbles on this "consideration" -
Brett327 said it most clearly. There is no debate, no even discussing a preferred sidearm - cuz you don't get to choose. You get a govt issue sidearm, and sneaking in your own is a court martial offense equivalent to a felony. ...unless something changed in the last decade in some amazing way.
When one goes to sea to fly "green time" (combat time) - that's generally when you get an issue one, to lock in your safe in your stateroom (I heard some boats/airwings require pickup at the armory or ready room), to only remove to fly with.
We flew with govt issue .45 ACP (I far prefer), and then bleh 9mm. from 70s til 2008, used them when issued, with a single woe. Gunners mates (or whatever the rating is now) pride themselves on not giving you crap. Like a Pararigger, they know the weapon is there for your survival. All were decent pistols, not made rattly and loose by being range weapons.
There are alotta reasons why Uncle Sam cringes even at the thought of personally owned and flown sidearms, some include - no verification of quality, safety, common rounds, trace-ability, etc. They don't let you buy or pack your own chute in your seat for your own good - so why would they let you chose your own ammo, weapon, and security plan? Scare them more if you do your own reloads (and are not SF/SOF).
Heck - if the Navy would never let you bring a laptop onto a ship or base and connect it to the GIG/NIPRNET lest you have a chat with the 2-
star, ...and to boot, no thumb drives or smart watches in any classified space. Now, up the ante to pistols - ya think firearms would be welcome? heh.
In the Military you use issue equipment, including sidearms (despite the stories).
Remember also - carriers have particularly sensitive aspects regarding weapons. But just like a base, you cannot bring ANY firearm on any US base without identifying it at the gate, then depending on that base procedure, have the armory meet you or you go there, to lock your stuff up. Til you leave. Even here in Arizona <wink>. Bases and boats = high security and AT/FP. In fact I would not even ask the above attention-getting question lately.
A last thought. Maybe they gave you some perspective if you went to SERE school, or elsewhere. Don't think the aviator's sidearm is some holy solution to your protection if you punch out in a hostile land. Judicious use consideration (even if it WERE your magic personal pistol), or even possession, is as much to think about as anything. Your goal is evasion and return to friendlies, not play soldier once on the deck. Many people carry sidearms as issued, but wish some other weight were in their SV-2 (or whatever is flown now) that would be far more appropriate in evasion (covert) survival... There was a joke once about the real extent of sidearm value: how much money a sidearm would take in a trade, to get a camel ride to friendly territory - heh heh.
Make smart decisions - and good luck wherever you are now. And if you enjoy the perennial debate on home defense or carry, concealed carry, off boats and bases, why it's Arizona and I have plent to then discuss <wink>