On March 3 the 2012 MileagePlus program begins, and MileagePlus becomes the single loyalty program for the new United. A final update will be emailed to members over the coming days and will include important details about account numbers, PINs and passwords, as well as some notes about what to expect for the weekend of March 3, as United completes its system migration.

The email will direct the member to log in to his/her personalized page where, based on current program affiliation (MileagePlus, OnePass^® or both), he/she will receive a combination of messages. Members should be encouraged to log in to their personalized page to get all the details. Below are a few highlights:

Members of only MileagePlus will be shown their new, eight-character alphanumeric account number for use beginning March 3. This new account number will not be active until March 3 and should not be used until that time.

Members of only OnePass will receive a message confirming that their eight-character account number will become their MileagePlus account number beginning March 3. This account number may be used immediately.

Members of both programs who have linked their accounts will see confirmation that their OnePass account number will replace their current MileagePlus number beginning March 3. The former OnePass eight-character alphanumeric number should be used beginning March 3.

Any reservations made using an 11 digit account number will continue to receive credit for miles flown after March 3. 11 digit numbers will continue to be accepted for a short period following the introduction of the 2012 program; however, members are strongly encouraged to update their individual profiles online and with agency and travel partners as soon after March 3 as possible.