Travel agency Flight Centre has appealed an $11 million fine for anti-competitive behaviour.

Federal Court judge John Logan imposed the fine in March after the court ruled in December that Flight Centre had threatened to stop selling flights on several airlines in order to offer the lowest fares.

In a case brought by the Australian Competition and Consumer Commission, Flight Centre was found to have induced Singapore Airlines, Malaysia Airlines and Emirates to stop offering international airfares that were lower than fares offered by the travel agency.

The court found Flight Centre had broken the law on five occasions between 2005 and 2009.

Flight Centre lodged an appeal on Thursday, saying the judgment contained “errors and inappropriate extensions” of the law.

“The penalties are manifestly excessive given the circumstances and the lesser penalties handed down in other cases, where the law was knowingly breached and there was a clear impact on the market,” Flight Centre statement said.

The appeal is likely to be heard before the end of 2014, the company said.