10:27 AM PT -- 1/25 -- A spokesperson for Frontier tells TMZ ... the airline is fully committed to the health and well-being of all customers and crew members. What's more ... Frontier is "reviewing the video and investigating what transpired during the flight."
The spokesperson added, "Frontier has a comprehensive set of protocols that includes a health acknowledgment for all customers, temperature screenings for passengers and crew members before every flight and enhanced cleaning of aircraft."
A passenger on a Frontier Airlines flight was coughing and sneezing, and when the passenger in front of him complained to the flight attendant, the passenger was told he had the option of driving ... and the exchange got even hotter after that.
It went down Thursday on a flight from Miami to Philly. The passenger who shot this video was in seat 25C on a packed flight. The passenger in row 26 right behind him was hacking and sneezing, to the point the passenger in 25C requested to move to the back of the plane.
He moved to the back, and after the plane landed he complained to the captain the guy in row 26 was clearly sick. A flight attendant intervened, and said, "You have an option. You can drive your car if it's a problem," adding, "You can't tell people to get off the plane if they got a cough and they're sneezing."
The passenger persisted, claiming the other passenger was sick, to which the flight attendant fired back, "You're no doctor."
We're told passengers had a temperature check at the gate before boarding.
At one point a flight attendant who is not seen in the video tells the passenger he should be on a no-fly list and the flight attendant you see agrees. Again, the captain is looking on during the exchange.
The complaining passenger did not file a complaint with Frontier. We reached out to Frontier Airlines ... so far, no word back.