TORONTO — Norwegian Air is already causing turbulence among U.S. legacy carriers with its low-cost transatlantic flights from the U.S. to Europe. Now comes word that the low-cost carrier has filed with the Canadian Transportation Agency, with an eye to possibly starting transatlantic flights out of Canada starting this summer.

According to airline news site Aviator, Norwegian’s filing with the CTA means it could be up and running with flights out of Canada by July 23.

Norwegian has more than 500 routes servicing a network of 150+ destinations.

While it’s not the only low-cost or ultra low-cost carrier serving U.S.-Europe routes (others include Primera Air and WOW Air, both also serving Canadian gateways), the LCC’s expansion has garnered enough market share that legacy carriers including American and Delta, as well as British Airways, now offer bare-bones basic economy fares on transatlantic flights. Air Canada and WestJet have also added basic economy fares, to and from select gateways.