Here are the flight numbers for the trips the plane made after dropping the patient off in Dallas:
Dallas to Cleveland - Frontier flight 2042
Cleveland to Ft. Lauderdale - Frontier flight 1104
Ft. Lauderdale to Cleveland - Frontier flight 1105
Cleveland to Atlanta - Frontier flight 1101 (landed in Atlanta at 9:07 p.m.)
Atlanta to Cleveland - Frontier flight 1100 (left Atlanta at 9:57 p.m.)