We used them last year and I did two things to mitigate any issues which are possible with any of the airlines. I bought an annual trip insurance plan (paid for itself a few months later when I cancelled a different trip). We also stayed in SJU one night on our way there and two on our way back. Way there we just went to the nearby embassy suites and relaxed at the pool, had dinner and got some sleep. Breakfast in the morning before heading to the airport for a 10am flight. Return we spent 2 nights at the hyatt grand reserve which was a great time. Staying made for a more relaxing travel time and reduced potential issues caused by delays.