American football teams and the military regularly charter that size aircraft to move personnel. The Arizona Cardinals own five 777s. The New England Patriots own two 767s. In addition to flying cargo, Atlas Air does passenger charter with a fleet of ten 747s and 767s.
https://www.planespotters.net/airline/Arizona-Cardinals
https://www.planespotters.net/airline/New-England-Patriots
https://www.planespotters.net/airline/Atlas-Air