"We're pleased with the court's decision," Delta spokeswoman Betsy Talton said Wednesday.
The plane crashed shortly after taking off from the wrong runway at Blue Grass Airport on Aug. 27, 2006, killing 49 of 50 people on board.
Forester said in his ruling that Comair carries out its own flight operations, while Delta did not own or operate the Comair plane and had no legal control over the pilots of the crashed jet.
"Delta has no right to fire or otherwise discipline Comair pilots for violating Comair's polices or procedures and/or aviation regulations," the judge wrote.
"In short, there is no allegation that any Delta employee failed to exercise reasonable care in the performance of his/her duty in any manner in respect to Flight No. 5191," Forester wrote.
Plaintiffs' lawyer David Royse told the Lexington Herald-Leader that the dismissal of Delta from the lawsuits won't affect an Aug. 4 trial on damages.
"Out of an abundance of caution, some plaintiffs had simply named Delta, Comair's parent company, as an additional defendant," Royse told the newspaper.
Comair spokeswoman Kate Marx said the ruling will have no bearing on her company's case.
Messages left late Tuesday by The Associated Press at Royse's office weren't immediately returned.
