There are many factors that come into play here. For some a TRT dose is 75mg of test per week. For others is it 500mg or more. Some use only short esters, some use only long, some use blends. I do daily injections. Some do weekly or even biweekly. Some have a body that will more quickly metabolize the ester and free the test, for others it takes twice as long.
I think in the end, you know your body and routine best. If you can manage the trip without an injection, why take the risk, even if it is miniscule. If I didn't do daily injections, I'd leave my gear at home for short weekend flights, even though I've flown dozens of times with zero problems.
That said, if I was in the middle of a blast, there is zero chance I'm leaving anything at home. I'm not going to take a chance that I won't get 100% of the benefit. We only have so many in the tank.