Representatives of the two U.S. airlines confirmed on Friday that both have matched a $3 surcharge each way unveiled by Delta Air Lines Inc
United Continental Holdings
Under the law, airlines touching down or taking off in the European Union and three neighboring nations must acquire permits for the carbon they emit. The measure has drawn opposition from the United States, China and others.
Some industry watchers have said airfares between the United States and Europe could rise as much as $90 as carriers look to pass along the expense to passengers.
(Reporting By Karen Jacobs, editing by Dave Zimmerman)