Southwest Airlines already has a policy of requiring obese passengers to purchase 2 tickets. There was a well-publicized case in the US recently of "plus-sized" filmmaker Kevin Smith being told to get off a full Southwest plane. He had to wait for the next flight which had 2 seats available.

I was on a non-Southwest flight a year or two ago and was seated next to a morbidly obese passenger. I had an aisle seat, he was in the middle. The flight was 100% full. A flight attendant gave him a seat belt extender without him even asking. Both arm rests next to him had to be raised for him to fit. His fat pushed against me and the window seat passenger. It was a 3 1/2 hour flight. Fortunately there was no turbulence so I spent most of the flight standing in the galley. The flight attendants understood my situation and didn't hassle me about standing there.

As for Delta's excessive bike fee and their absurd rule essentially discriminating against cycling customers based on the contents of their suitcase, it seems to me that social media like Facebook are an excellent way to fight back and hopefully get them to reduce their bike fees as well as drop the folder fee.