In 2020, United Airlines cargo revenue increased by $500M year over year, from 1.1B to 1.6B.
In 2020, United Airlines passenger revenue decreased by almost $28B year over year, from 39.6B to 11.8B

So the 2020 increase in cargo revenue was able to make up 1.8% of the revenue deficit from passengers. WOW. We should definitely get into the cargo bidness.