Disagree completely. If you're going to use that line of reasoning and apply it to the time you spend on the plane, then where does it stop? I wouldn't be in the taxi from the airport to the hotel if not for work, so is that work time? I wouldn't be in the hotel if not for work, so is that work time?

So are you saying when you go on a business trip, you're on the clock from the moment you leave the house to the moment you return home? And if that's not what you're saying, than how is plane time different from any other activity I'm doing while on a business trip? Lets face it, if I'm on a 4 day business trip, no matter where I am at any point over those 4 days, I wouldn't be there if not for work. If I check into my hotel at 6p every night, am I expected to be doing work until I go to bed, since I would not be there if not for work?