An air ambulance company is suing the Punta Gorda Airport and Charlotte County Airport Authority after getting contaminated jet fuel back in May.

Air Trek filed papers this week for a “notice of intent to pursue claim.” The company says the jet fuel systems were contaminated with diesel while refueling.

Each of their two jets had patients in critical condition, family and crew onboard; a total of 13 people. Both aircraft experienced engine failure about two hours into their flights, causing one to land without a working engine.