Airline partners and global alliances. Alliances built around your needs. You can earn and use MileagePlus miles on more than 35 airlines worldwide. Select a Star Allianceâ¢ or MileagePlus partner airline below for more information about earning miles on flights operated by that airline.
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System Undergoing Maintenance. This website is temporarily out of service due to system maintenance. About PECOS. PECOS is the application that supports the Medicare provider and supplier enrollment process by capturing provider/supplier information from the 855A, 855B, 855I, 855O, 855R and 855S forms.