We're Delta fliers. Delta code shares with Silver but won't do a straight ticket as there is a 56 minute connection between our arriving flight in SJU and the departing flight on Silver (they have a 1 hour rule for international connections). Delta and Silver are within 5-6 gates of each other at SJU (Terminal B). Is it safe to book these separately if we carry on? Saves $400+ per person vs the Cape Air fares.