From the article :

"However, federal law requires all Customers two and over to wear a face mask while at the airport and onboard the aircraft."

No there is no federal law.

Banks and the airline industry are the only two industries fully and completely protected by the US government. Why is that?

No matter how shitty the airline is, no matter how much money they lose, the government will always show up to bail them out. Follow the money and find out why.