Get yourself some snap caps, that low left (for a right handed shooter that is) on Glocks especially seems to be anticipation of recoil. Snap caps when blindly loaded in a mix with live rounds will help you with that recoil anticipation.
Try to use something that doesn't look like a gun case, like a generic Pelican instead of your Glock branded case. Use a proper (non-TSA) lock as well, and when you arrive, have it locked already. TSA regs don't allow them to open it or ask your combination, if they want to inspect it, you have to be the one to open it up. All that's usually required of you is keep the ammo out of the chamber/mag well, beyond that long as it's in a hard case and ammo isn't loose, TSA doesn't care.
Another good thing to know, if you're traveling with a handgun, put it inside your other checked baggage. That helps prevent it going to the baggage desk where you're most likely to run into trouble with steppers.
I feel like you can make up for it with good shot placement, recoil abatement with compensators, and the ability to carry more/lighter rounds. If you're going to battle with groups of commies, the engagement distance will allow good shot placement using a red dot or at most an ACOG. More bang will just increase the time between acquiring the next target at >100 yards.
A man of taste I see, the 19X is the "piece" de resistance in this photo. I've noticed no one ever says anything to me about not wearing a mask when I'm open carrying my 19X. However I gotta fly to CA in a couple months and you best believe I'm wearing a hazmat suit
Someone's been playing too much Into the Radius