We tried that a few months ago. Didn’t go well. We arrived at 4:30 am on the red eye from Houston, with a connecting flight on Seaborne at 7:30 am. Planned to use the lounge, to which we were entitled by Gold status and a pass. Lounge wouldn’t let us in. Then Seaborne sent our plane to Dominica, because they had failed to fly there the day prior. By the time they got back, it was early afternoon, as I recall.

A few weeks ago, we stayed overnight and were booked on the 7:30 am flight. They rescheduled us for later in the morning, and were still late. The Seaborne counter lady in San Juan told me the 7:30 am flight no longer exists.