The controversy over plans by Norwegian Air Shuttle AS to expand its trans-Atlantic services intensified Monday as a group of U.S. lawmakers moved to block the effort on the eve of a meeting with European Union officials aimed at keeping the issue from becoming a full-blown trade dispute.

Opponents of Norwegian's move to use an Ireland-based subsidiary for its venture--including the largest U.S. and European airlines--secured congressional support for a measure that backers said would block the U.S. Department of Transportation from approving the European carrier's application, which has been sitting before regulators since February.

The latest twist in one of the airline industry's most closely watched competition cases comes ahead of a Tuesday meeting in Vienna between European regulators--who back Norwegian's application--and their U.S. counterparts, at a time when the two sides are seeking a broader free-trade deal.

Norwegian, Europe's third-largest budget carrier by revenue after Ryanair Holdings PLC and EasyJet PLC has already delayed to July from April plans to launch new trans-Atlantic flights using its Ireland-based NAI unit.

Opponents of Norwegian Air Shuttle's plan say the company aims to circumvent European labor laws by registering aircraft in Ireland and hiring cheaper staff at local bases in Europe, Asia and the U.S. As Norway isn't a member of the EU, the carrier has had to set up the subsidiary in Ireland to take advantage of agreements between the EU and U.S. Norwegian's supporters said detractors are trying to stifle competition.

The U.S. House of Representatives on Monday passed an amendment to the proposed Department of Transportation budget request intended to block Norwegian's application.

European officials have been pushing Norwegian's case and said they expect the DOT's delay to lead to "very spirited discussions," during a Tuesday meeting of the special committee set up to oversee the two sides' open skies aviation treaty.

"The strategy seems to be to allow [Norwegian] to bleed slowly to death as the administration seemingly cannot move. But if they don't grant the permit, it is in violation of European rights under the [open skies] agreement," one European official said.

A DOT spokeswoman said Norwegian's application is pending before the Department because "it is a contested proceeding," but that the department "cannot comment on the merits of the case."

Norwegian is the first of a new breed of low-cost airlines to launch trans-Atlantic flights and has said its expansion would boost competition.

Addressing criticism that it is simply looking to hire cheap labor, the carrier has said it is seeking an Irish license to gain access to airline traffic rights that aren't available in Norway and to secure more attractive aircraft financing rates.

Norway's budget airline recently began putting together a fleet of Boeing Co. Dreamliners and has already been operating trans-Atlantic long-haul flights from Scandinavian hubs such as Oslo, Stockholm and Copenhagen to New York and Fort Lauderdale. But to be competitive, it needs to fly from larger hubs, such as London, and to do so a new U.S. carrier permit is necessary.

Opponents of Norwegian Air Shuttle's plan say the company aims to circumvent European labor laws by registering aircraft in Ireland and hiring cheaper staff at local bases in Europe, Asia and the U.S. As Norway isn't a member of the EU, the carrier has had to set up a subsidiary in Ireland to take advantage of agreements between the EU and U.S.

EU officials have supported Norwegian's plan under the existing aviation treaty and expected the U.S. to do the same, based on the agreement signed by the two sides in 2007. The U.S. hasn't issued a formal reply and if the situation isn't resolved soon it risks "evolving into a big issue," the European official said. Norwegian's application has been raised in previous meetings.

"It cannot be that the EU-U.S. agreement only operates when one side says so," the official said.

Write to Christina Zander at christina.zander@wsj.com

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