Air One "Smart Carrier" is Alitalia's leisure subsidiary based in Milan Malpensa Airport and headquartered in Fiumicino, Italy. Before the merger with Alitalia, Air One was a competitor, the second largest airline in Italy, with a high-frequency scheduled network to 36 destinations in Italy, Europe and North America. Its main bases were Leonardo da Vinci-Fiumicino Airport in Rome, Linate Airport in Milan and Turin International Airport.
As of 31 December 2008, Air One is part of Compagnia Aerea Italiana (CAI), which has taken over Alitalia and Air One as one whole company. Alitalia still uses some Air One codes (AP) on Alitalia flights, as with Alitalia Express and Volareweb.com. These airlines don't officially exist anymore, and simply add to the mainline Alitalia.
As of 28 March 2010, Air One as Air One Smart Carrier has relaunched as a low-cost airline to operate low fare flights from Milan Malpensa on behalf of Alitalia. Air One is now therefore considered different from Alitalia, even though it is still owned by Alitalia.

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