I checked a bottle on a domestic flight last week, no issues. Internationally, I don't know; I'd imagine it depends on the arriving country's policies.
I like to go big or go home. I used 4 oz of whole Cascade in my last 5 gal batch of an XPA, and it was incredible. No bag, and most of the hops settled in the cold crash.
You could point out to this lucky sumbuck (geez, his wife brews, if that's not the definition of heaven, then what is?) that plenty of commercial breweries get used longnecks from bars, refill and sell them....