Huh? The TSA only operates in the US..." Qupote
You would think TSA is only in the US, but every time I leave GCM, my carryon camera bag gets flagged and pulled apart, and just before boarding, I get paged to go to a back room, and my checked bags get inspected. And I have Global Entry, known traveller status with all the airlines. So after the third consecutive time this happened to me, I found a security supervisor at GCM and politely asked her what I could do to make it easier for the screeners to see I was not bringing anything objectionable on the plane. She said it wasn't local security, but US TSA that was flagging me. The curious thing is that I fly on average at least once a month, much of it international, and GCM is the only airport where I have any issues. Now, I just put my camera, strobes, dive lights, computer in my backpack so those items are easy to pull out for inspection
Morecowbells: Interlining bags into GCM often results in your luggage arriving on a later flight. Take medicines and anything you need for an overnight stay in your carryon. TSA out of Miami will only be half the hassle. The waiting time to get through GCM immigration has run a full hour for flights arriving in the 2:30ish time frame. The new airport is a major physical upgrade, but that line is a painful bottleneck. There is a VIP service for about $60 which will whisk you through the local line in a NY minute.