Flight attendants at Frontier Airlines have chosen to strike after the airline refused to negotiate with the union regarding its change in business model, which has severely and negatively impacted its flight attendants.

Frontier Airlines flight attendants voted to authorize a strike over a business model change they say has resulted in less pay, the Association of Flight Attendants announced Wednesday. The vote was spurred by the Denver-based airline switching to a business model that includes more one-day trips and fewer multi-day trips for flight attendants,

Multiple flight attendants have, over the last year, sounded the alarm over a sharp increase in passengers who get belligerent, resistant of rules or outright violent. JetBlue Airways (JBLU) flight attendant and president of a Transportation Workers Union Local 579 branch Tyesha Best once described to TheStreet how a passenger who was told he could not use the lavatories during turbulence peed in an empty bottle and started waving it around while calling the flight attendants onboard the c-word.

A Frontier Airlines flight to San Francisco was diverted after a passenger allegedly began acting erratically and shouted, “This airplane is going down!”

A 30-year-old man from Fremont, California, Charles Angel Salva, is facing federal charges after allegedly attempting to choke a flight attendant and threatening to kill everyone on board a Frontier Airlines flight.

A man is facing federal charges after allegedly choking a Frontier Airlines flight attendant and screaming that a San Francisco-bound plane was “going down” before threatening to kill all the passengers on board.