Each claimant is seeking damages over $500,000
Two passengers are suing United Airlines after the engine of the plane they were on caught fire in mid-air.
Joseph McGinley and Jonathan Strawn say they have suffered personally, emotionally, and financially as a result of the incident on 20 February.
They have filed separate lawsuits in Chicago, where the airline is based, and are seeking damages of more than $500,000 (£361,000) each.
Passengers said they feared the Boeing 777 would crash and they would die after seeing the explosion and a flash of light.