In May, I recall our luggage transferred from American to Seaborne. We've made so many trips on so many carriers since Irma it's hard to recall, and it took SJU a while to get their systems back running.

Next week we're flying American and transferring to Cape Air on coupons. AA confirmed that luggage transfer is supposed to be possible, but apparently is not yet supported by their software, although United and Jet Blue can do that.

Another advantage of one ticket is that, should you get held up along the line, the carrier has to put you up.

InterCaribbean doesn't partner with any of the US carriers.