Transcript for Chaos ensued after Spirit Airlines cancelled 11 flights and delayed dozens more

We turn next to a troubling new case a new brawl breaking out on a passenger plane, an altercation between passengers while on the tarmac, a flight attendant caught in the middle. And it comes after the chaos we saw overnight at the ft. Lauderdale airport. So many American passengers asking, what's happening? Here's ABC's David Kerley. Reporter: Another sign of civility disappearing from aviation. A flight attendant pleading for security and the captain. Stop it! Reporter: And then that same flight attendant slammed to the floor as the two men continued to fight at their end of their flight. Three passengers were involved before being pulled apart. One arrest the Sunday incident the day before this. Terminal turned into a near-riot scene. Police in ft. Lauderdale called in when a crowd becomes angry and agitated that spirit airlines is cancelling flights again. Very tense, very angry, angry people. Everybody had places to be. Reporter: The travel nightmare continued this morning, dozen flights cancelled. Among those arrested this 24-year-old. I was upset. Reporter: Spirit's week of cancellations labor trouble because pilots are refusing overtime flights. They ruled for the airline but individual pilots can still refuse extra flights. Both these incidents a reminder of the unfriendly skies. Southwest praised its flight attendants, spirit apologized to its passengers. David. David Kerley in Washington. Shift in U.S. Military

This transcript has been automatically generated and may not be 100% accurate.