You have to jump through a lot of hoops before ever stepping foot on a commercial airplane.
First, you’ve got to check in to your flight (although, you can do that online these days) and hope it doesn’t get delayed or canceled. You’ll also need to take off your shoes, your coats, and electronics just to be herded through long security lines (although there are ways to avoid that, too). Then you have to wait for your flight to board and the chaos that usually brings. But would you agree to do one more thing before stepping on an airplane? For example, would you agree to be weighed?