US Airways (Phoenix) yesterday (March 31) as planned, completed its transition to Oneworld along with TAM Airlines (Sao Paulo) marking the biggest single-day expansion of the alliance since its launch 15 years ago.

US Airways’ regional affiliates, operating as US Airways Express, also transitioned to Oneworld, following US Airways’ recent merger with American Airlines (Dallas/Fort Worth).

With its regional affiliates, US Airways serves more than 200 destinations and 30 countries with a fleet of more than 620 aircraft. It carried 82.5 million passengers in 2013 and currently operates 3,200 departures a day. It uses the two-letter code US, but this will be changed to AA once the two airlines combine under a single operating certificate.

It has added more than 50 destinations to the oneworld map – most in its US home but also two in Canada and one each in Ireland and Mexico – along with its key hubs of Charlotte, Philadelphia, Phoenix and Washington DC’s Reagan National, expanding oneworld’s presence across the USA, particularly throughout the East Coast and across the North Atlantic.

Once the integration is completed, the new American will offer service to more than 330 destinations in more than 50 countries, carrying 190 million passengers a year on a fleet of 1,500 aircraft.

US Airways: