I ended up with Covid after my cruise to Alaska but I think it came from the airport and the flight home. My flight was much later in the day so I spent a lot of time at SEA-Tec and then a 5+ hour flight home. My positive test was exactly 5 days after my flight. I tested the day before that and was negative. So I'm attributing to the airport time and the flight which was packed. I have been vaccinated with just one booster and this was my first Covid infection.