The league's current bargaining agreement runs until January 31, 2020, and Rooney thinks players should demand more money.
"I feel that American players get underpaid," he told ESPN. "I feel they deserve to get more money to stay in line with football in the rest of the world but also in terms of the American sports.
"I'm not saying it to benefit me, I obviously won't be in the league next season. I think it's only fair to those players who are putting in the same work as all have to earn the right to earn more money for doing it."
He added: "I think the flight issues, in terms of you get so many chartered flights, I believe if a team wants chartered flights than they should be able to charter as many they want. They should be able to do whatever they want with that."