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So when we get to Miami and spend the night, are we supposed to get our checked luggage. Or do they hold it for our flight the next morning?
It can be quite confusing and busy at MIA as it is an AA hub. Look for a roving AA agent outside the lines to tell you what line to get in to go to Bonaire.
If you are late in the morning or the lines look insanely long I would just pay the extra $30 for the bag at the kiosk. Trust me I wish I did in June even though it ended up well and I made my flight. The stress of the situation was not worth saving $30.