One thing to remember is that the ship's radio won't be on when in port, so it's not an urgent thing to go back to airplane mode. You know that but for others that are casually reading this
I've witnessed a couple medical incidents that required security to clear the area and it took passengers to do the job because security just stood there and watched the chaos
Not really true. You're more likely to have false negatives with antigen tests, but you can test positive upwards of 12 weeks after recovery with a PCR test.
Air2Sea at its roots is just a travel agent.
But RC can subsidize some airfare, especially international routes. You can also change your flight for no penalty until cruise final payment.