it is concerning that another jet aircraft began a takeoff roll at a busy airport without hearing the magic words "cleared for takeoff "
It happens, friend took off from a major national airport without hearing the magic phrase that wasn't given in a jet fighter early '70's. Early '90's was stood whilst waiting for my flight watching runway proceedings at West Palm Beach, Shorts 360 lined up on 14, Gulfstream lined up on 10, someone dropped the flag and the race was on, both aborted prior to the intersection.