Ryanair Holdings Plc, Europe’s biggest discount airline, lost its bid to challenge a U.K. antitrust regulator’s decision to seek an investigation into its minority stake in Irish competitor Aer Lingus Group Plc. (AERL)

The U.K.’s supreme court ruled today that Ryanair doesn’t have the right to appeal a lower court ruling that the Office of Fair Trading was entitled to ask the Competition Commission to examine Ryanair’s holding in Aer Lingus.

“The OFT can now proceed swiftly to complete its investigation into Ryanair’s shareholding which is contrary to the interests of consumers and the majority of Aer Lingus’ shareholders,” Aer Lingus said in a statement.

To contact the reporter on this story: Jeremy Hodges in London at jhodges17@bloomberg.net

To contact the editor responsible for this story: Anthony Aarons at aaarons@bloomberg.net