LEXINGTON, KY. ? The family of a woman killed when Comair Flight 5191 took off on the wrong runway and crashed in flames sued the airline Friday, blaming it for the nation’s deadliest airplane disaster in five years.

The lawsuit accuses Comair of negligence and says passenger Rebecca L. Adams suffered “conscious pain and suffering” when the plane went down Sunday morning and quickly burned with 49 people still inside.

The only survivor was the co-pilot, who remained hospitalized Friday but was upgraded from critical to serious condition.

The crash “could not have happened if those having control of the instrumentality had not been negligent,” attorney Bobby Wombles, of Lexington, said in the lawsuit.

Adams’ son, Joshua Isaac Adams, said the family was pursuing legal action “so that we can one day have the answers we need.”

The action needed to be taken immediately to make the family a full part of the investigation, giving it power to subpoena witnesses who also are being questioned by federal investigators, said another of the family’s attorneys, Robert Clifford, of Chicago. Other families also have contacted his firm, he said at a Lexington news conference.

No specific damage amount is listed in the lawsuit, which was filed in Fayette County Circuit Court.

Prominent Cincinnati attorney Stan Chesley also filed a suit on behalf of the family of victim Joann Wright, as well as a motion for a preliminary injunction, he said in a news release Friday.