They say the subsidiary's business model will drive down wages and undermine safety, which Norwegian denies. Delta Air Lines, which carried more passengers last year than any airline in the world, has been campaigning to block the U.S. Export-Import Bank from helping foreign competitors such as Air India and the Gulf carriers finance the purchase of planes from Boeing. Delta says the planes are used to compete on routes Delta also flies. Boeing is the nation's largest exporter in dollar terms. Calling the bank "corporate welfare," tea party conservatives in the House have prevented Congress from renewing the bank's lending authority, which lapsed on July 1. U.S. airlines are not united on these issues. Delta is alone in its opposition to the bank, and some airlines like JetBlue oppose the big three's position on the Gulf carriers. JetBlue transports passengers arriving in the U.S. on those carriers to other cities.