Bloating/gas on long flights

Even with trying to adequately hydrate ... flying constipates the hell out of me.

Gives a new meaning to the Bob Segar song.. “ Like a rock... ohhhhhh like a rock”

Stop drinking carbonated drinks?

—Don’t dehydrate.....get a refillable water bottle and fill that sucker up after you clear security. Drink water throughout your flight. This is key: flying is like walking through the desert....hydrate as though you’re trekking across the Mojave. Staying hydrated has the bonus effect of forcing you to get up and walk to the restroom, another good tactic to reduce bloat.
—skip the carbonated beverages and crap food at the airport. Eat a mix of fibrous fresh fruit (like an apple) and something whole grain (like whole wheat crackers).
—avoid any foods you know will make you bloat (excess of onions, beans, cabbage and its cousins).
—walk as much as possible once at your destination. If it’s dark/late/schedule is too jammed, at least take the stairs rather than the elevator.

Just adjust that overhead vent so it is blowing down in your lap and let it rip.

Fart more. You'll feel better and as a side benefit you'll cut short the mindless chitchat of your seatmates.

Or figure out what in your diet is causing the bloating - dairy, wheat, etc and limit it before trips.