Sorry to dispute you Trailboss123 and caydiver, but your statements are not entirely correct.
TSA pre does not work for all carriers at all US airports in all instances.
Non US flagged carriers do not have to recognize Global Entry, known traveler, or TSA Pre, and many do not.
I’ve had a Global Entry account since the plans inception and can recall many instances where Pre-check has not been available on international flights departing from the US. On recent departures from LAX I’ve flown on Air France and Fiji Airways. In both instances there was no TSA Pre available from those carriers. Likewise, a recent flight from MIA on Turkish Airlines did not offer TSA Pre. My most recent flight to Cayman was aboard a US flagged carrier, so I’m not familiar with current Cayman Airways protocols.
In the vast majority of my returns to the country, Global Entry status has worked as designed, but I do recall a pair of instances where the process was not silky smooth. On a recent arrival at MIA from Cuba, all passengers on my flight were led directly to the regular immigration line without access to the Global Entry kiosks. On another return to the US at MIA, all passengers on my flight from Cairo were denied access to the Global Entry portals, though this came in the wake of a notorious act of political/terrorist violence.
My suggestion to the OP, morecowbells: if you cannot confirm TSA Pre with your carrier, plan to arrive at MIA early enough to deal with “normal” check-in and security procedures.
I’m not a big fan of MIA, even though it is my “home’ port for much of my international travel. For outbound flights it has one positive aspect that I appreciate; good coffee is available if you know where to look. (Hint: It’s not Starbuck’s.)
Inbound: After dealing with the line at immigration, (if the Global Entry kiosk is not available), the joy of reading the sign that says “Welcome To Miami” that adorns the vending machine that for a meagre $5.00 will usually allow you to liberate a luggage cart with one wobbly wheel and a sticky handle, doing the luggage carousel bumper car rhumba after what may be a lengthy wait, you pick up your bags, (hopefully all there and with most or all of their contents in place and undamaged), and exit the terminal into the sultry air, redolent with the noxious fumes of bus exhaust, I know that I’m almost home.