Customs and Connecting Flights
 

(I apologize in advance if this is in the wrong forum.)

I booked a round trip flight from NYC to Grenada, and there are layovers in both directions of about 55 minutes. On the way to Grenada, the layover is in Miami, so while 55 minutes may be tight, I feel pretty good about making it. On the way back, we'll have a 50-minute layover in San Juan, Puerto Rico. I don't know why it didn't occur to me beforehand, but will I have to go through customs in San Juan? If so, I can't imagine how we will possibly make it through in time.

Yes, you will have to clear customs in San Juan. Are you a US citizen? I've never cleared in San Juan do I don't know the airport or how long the lines are, but that seems tight. Also, will you have checked luggage, if yes, then almost impossible

what carrier[s].....may or may not matter, but may elicit info from one who has done it...

You can get the average wait times by date and time here

http://apps.cbp.gov/awt/

I would try for a later flight out of San Juan, I think you are cutting it pretty tight

Are these legal connections on one ticket? What is minimal connecting time from international to domestic?

AA MCT at SJU is 50 minutes if one flight is on AA2700-5099, for what it's worth. Without more specifics from the OP I am only taking a random guess.

I think that 50-mins. cuts it way too short, even if AA lists that as the MCT. Only takes one problem child in the line ahead of you and there becomes zero chance you make your flight. At a minimum, I would not check luggage so that at least you can avoid the wait for luggage @ SJU and head for your connecting gate.