In March 2008, an Open Skies Agreement between the U.S. and the European Union became effective, invalidating Bermuda II restrictions that had limited the number of carriers and cities in the U.S. that could serve London-Heathrow. In November 2007 Continental announced that new, nonstop, twice-daily service from its hubs at George Bush Intercontinental Airport and Newark Liberty International Airport to London-Heathrow would be offered; and this service was inaugurated on March 29, 2008. The service replaced existing frequencies to London-Gatwick and were offered with a combination of Boeing 777-200ER and 757-200 equipment, with flat beds guaranteed in the BusinessFirst cabin. Continental has grown its presence at London-Heathrow to seven daily flights; two to Houston-Intercontinental and five to Newark.