NEW YORK ( TheStreet) -- An arbitrator has ruled against United Continental Holdings ( UAL) in a dispute between the newly merged airline and Continental's pilots, according to published media reports.United Continental had wanted to use regional affiliate United Express for some flights from Continental's hubs in Houston, Newark, N.J. and Cleveland and put Continental's name on those flights, the Associated Press reported Friday. > > Bull or Bear? Vote in Our Poll But Continental's pilots' union had said that its contract required that Continental pilots fly planes with more than 50 seats on them, the AP added. Arbitrator Richard Bloch agreed with the union in a ruling issued Thursday, the AP said. Shares of United Continental Holdings closed down 19 cents Friday at $23.82.