You’re going on a cross-country trip. Airplane, train, bus, car, or bike?

Perhaps when I was in high school or college, I would’ve done the classic road trip. Most likely there would be bumps in the road; flat tires , the car conks out in the middle of nowhere, and then some. They would be funny stories I would tell my grandchildren. But at my age, I like the luxury of going one place to another in less than a day and have someone wait on me.