The NFL hasn't learned that lesson yet.
The Airlines are about to learn it.

They didn't need to lol

Sponsorship spending on the professional football league and its 32 teams rose 5.9 percent to $1.32 billion in the 2017-2018 season, according to ESP research. Spending rose 4.3 percent in the previous season.
The increase exceeds the year-over-year increase in 2017 sports spending and overall North American sponsorship spending, both of which grew 3.5 percent.

http://www.sponsorship.com/Report/2018/01/29/NFL-Sponsorship-Revenue-Totals-$1-32-Billion-In-20.aspx