Federal officials are seeking more than $650,000 in fines against Alaska Airlines and its Horizon Air affiliate for alleged safety violations.
The Federal Aviation Administration said Thursday that Horizon sent an aircraft on 45 flights without required checks for cracked or corroded fittings on the engine housing.
The FAA also said it would seek a $210,000 civil penalty against Alaska Airlines, charging that the airline failed to properly tag turned-off equipment before making repairs to Boeing 737 jets. It said the violations of worker-safety rules occurred 10 times in 2010 and 2011.
Seattle-based Alaska Air Group Inc., which owns both airlines, says it followed regulations in both instances, but failed to properly document it.
The airlines have 30 days to respond to the FAA.