Multiple arrests were made as chaos unfolded at a Florida airport Monday evening after several Spirit Airlines flights were canceled.

Lines are longer than usual. Hundreds of flights have been delayed or canceled during the past week. By Monday, frustrations boiled over for Spirit Airlines passengers in Fort Lauderdale.

Police were called to quell fights that had broken out there between upset fliers and beleaguered airline employees. Videos posted by passengers showed a chaotic scene, with authorities doing their best to separate fighting fliers.

Ultimately, police said that they arrested three people, charging them with inciting a riot, disorderly conduct, resisting arrest and trespassing, The Associated Press reports.

The Monday evening incident erupted after Spirit Airlines abruptly canceled several flights, according to CBS News. But problems had been building at the carrier for the past week, with Spirit acknowledging that nearly 300 flights have been canceled during that period.

What’s the problem? Spirit Airlines filed a suit Monday against its pilot union, alleging “an unlawful job action by Spirit pilots.”

Spirit said the Air Line Pilots Association (ALPA) and some of its members are “purposely and unlawfully disrupting the airline’s operations.”

In its suit, Spirit accused the union of being “engaged in a pervasive illegal work slowdown that has caused approximately 300 flight cancellations and has disrupted the travel plans of over 20,000 customers. … The Spirit pilots’ concerted refusal to accept junior assignments or pick up open time flying has dramatically impacted Spirit’s operations leading to cancellations throughout its system, and most particularly for flights departing from Fort Lauderdale, Chicago-O’Hare, Detroit, and Las Vegas.”

Spirit suggested the effort was an attempt by the union to affect contract negotiations.

“We are disappointed that ALPA has decided to engage in this unlawful slowdown,” Spirit spokesman Paul Berry said in a statement to USA TODAY’s Today in the Sky blog. “This has led to canceled flights and prevented our customers from taking their planned travel, all for the sole purpose of influencing current labor negotiations. So we reluctantly filed this suit to protect our customers’ and our operations.”