Travel Southwest, American, United: No Boeing 737 Max flights until March even if plane returns sooner November 15, 2019November 15, 2019 Dawn Gilbertson, USA TODAY Comments Off on Southwest, American, United: No Boeing 737 Max flights until March even if plane returns sooner The Boeing 737 Max has been grounded since March following two fatal crashes. Boeing has said it hopes to have the plane recertified by December.