Flying anywhere outside the now oppressive “nanny state”, USA? Get apporopriate scripts while there, stop into any pharmacy and get what you need. Keep your script habdy and fly home with your legal meds.
LOL... not to sound rude but you obviously don't travel much outside the USA, for the countries where gear is "legal" these days or at least can be obtained through docs by scripts can be counted on one hand's fingers... South America might be easier in some places (same with Africa), but in EVERY damn European, Oceanian and most Asian countries, it's a huge no-no, and even TRT requires long weeks of bloodwork before some GP will accept to prescribe it, even more so to a foreigner.
Laws regarding AAS are pretty much the same WORLDWIDE these days... so "nanny world" would actually be more accurate...
As for OP's initial question, KillerStack's reply is certainly the closest from truth.