Negotiations for a new contract come at a time of rapid growth for the league, which has added 10 teams since . And the players want to share in that growth, through more liberal free agency and payroll rules, larger salaries and more expansive use of charter flights. MLS is the only major professional league in the U.S. whose teams still travel on commercial airline flights.
MLS and players union agree to one-week extension to work on new contract
