MileagePlus is the loyalty program of United Airlines and Aeromar that offers rewards to passengers traveling on certain types of tickets. Following the 2011 merger agreement between United Airlines and Continental Airlines, United Mileage Plus was chosen to be the frequent flyer program for the combined airline. The program was subsequently renamed to MileagePlus, and maintains its relationship with its Star Alliance partners, as well as other airline and travel enterprise agreements.
Following the integration and phase out of Continental OnePass on March 3, 2012, MileagePlus also became the frequent flyer program for Copa Airlines and Copa Airlines Colombia. The new program member IDs follow the OnePass format (2 letters + 6 digits) in lieu of the old Mileage Plus format (11 digits), and any members who had existing OnePass member ID numbers retained their existing numbers. In March 2015, Copa Airlines announced that it would phase out the MileagePlus program in favor of a new frequent flyer program called ConnectMiles.
Frequent flier programs were introduced in 1979 by Texas International Airlines. Two years later, American Airlines launched their AAdvantage program, and United's Mileage Plus was launched one week later. On June 29, 2011, United Airlines officially changed the name of the program from Mileage Plus to MileagePlus.
On July 9, 2011, Tom Stuker became the first member of the MileagePlus program to reach ten million flown miles on United. He earned this distinction flying from Los Angeles to Chicago on flight 942. Jeff Smisek, the president and CEO of United Airlines, was on hand to congratulate him. For reaching the ten million mile number, he was given the only United Titanium Card and his name was placed on the side of a United Boeing 747-400.
Several controversial changes were introduced to the program in 2012, following the integration of the Continental OnePass program into MileagePlus. This included the reduction in bonus miles for Premier Gold and Premier Platinum members, as well as the inability of Premier Silver members to reserve Economy Plus seats until 24 hours prior to departure. Changes have also occurred to the upgrade process, where upgrades are being sold at check-in for prices as low as $69, even when elites are still being processed on the upgrade waitlist. Million Mile Flyer George Lagen filed, in late May 2012, a class action against United for taking away or demoting "lifetime" benefits promised to pre-merger Million Mile Flyers. A federal judge eventually dismissed the class-action lawsuit on the basis that the contract which regulated "Million Mile Flyer" customers was the same as for all MileagePlus members, which essentially gave the airline the right to unilaterally reduce or discontinue benefits anytime it wanted to. 
In addition to United Airlines, all 25 members of the Star Alliance as well as a number of other airlines participate in the MileagePlus program to a certain degree. MileagePlus miles can then be both earned and redeemed on flights with United, as well as any partner airline. However, certain booking classes on partner airlines are excluded from mileage accrual.
The airline partners of MileagePlus are:
|Partner Airline||Star Alliance Member|
|Air New Zealand||Yes|
|All Nippon Airways||Yes|
|Azul Brazilian Airlines||No|
|Great Lakes Airlines||No|
|LOT Polish Airlines||Yes|
|South African Airways||Yes|
|Swiss International Air Lines||Yes|
MileagePlus miles (redeemable miles) can be redeemed for travel on any combination of United Airlines and United Express carriers, as well as Star Alliance partners and other airline partners. MileagePlus offers saver and standard awards, at two different tiers of pricing with different capacity control mechanisms.
Saver awards are capacity-controlled awards available for travel on all partner airlines. The release of saver award seats is dictated by the operating airline, who will make the award inventory available to all its partners, including United MileagePlus. On flights operated by United Airlines, additional saver award inventory is offered to Premier members, in addition to that offered to general members.
Historically, United Airlines engaged in the practice of preventing its MileagePlus members, regardless of tier, from redeeming rewards on certain Star Alliance flights (known as "Starnet Blocking"). At the time, United Airlines was the only known Star Alliance member to restrict access to reward flights that were available for redemption in the Star Alliance network. This practice was discontinued in 2011, after the merger with Continental Airlines.
Standard awards are only available for travel on United and Copa, and have greater availability than saver awards. Standard awards cost two to three times more than the equivalent saver award.
Redeemable miles do not expire, provided that there is account activity within the previous 18 months.
MileagePlus allows one-way redemption for half the round-trip price.
While status levels were not originally part of the MileagePlus program, they were introduced in 1987 to reward customers who had achieved certain qualification thresholds within a given calendar year. All Premier members are eligible for Premier Access, which allows them to use exclusive check-in and security lines, as well as priority boarding and baggage retrieval. Members reach Premier status by earning the required number of Premier qualifying miles (PQM) or Premier qualifying segments (PQS). Starting in 2014, members living in United States must in addition meet a minimum annual spending level, tracked as Premier Qualifying Dollars (PQD), on United issued tickets in a calendar year to qualify for a tier.
Million Miler Program
Million Miler Program is a program offered to MileagePlus members who have demonstrated a long term loyalty. The Million Miler Program balance is calculated based on the accrued elite qualifying miles prior to January 1, 2012, plus the actual flown miles on United and Copa Airlines after January 1, 2012.
Members receive the following lifetime MileagePlus Premier status based on their Million Miler Program balance:
|Million Miler Level||Lifetime Status|
|1 Million||Premier Gold|
|2 Million||Premier Platinum|
|3 Million||Premier 1K|
|4 Million||Global Services|
Members eligible for Million Miler status can also designate a companion (defined as their spouse, significant other, or another individual residing at the same address) to receive the same Premier status as themselves.
Infinite Elite was a promotional program offered by Continental Airlines in the early 1990s that offered lifetime Platinum Elite status on Continental for flying a certain mileage amount for a number of continuous years. With the integration of OnePass and MileagePlus, Infinite Elite members will be offered Premier 1K status, but will not receive Global Premier Upgrades.
Complimentary Premier Upgrades
Complimentary Premier Upgrades are offered to all Premier members on flights within Region 1, excluding Premium Service flights from Newark to San Francisco or Los Angeles, as well as flights between Honolulu and Washington, D.C. (IAD), Houston (IAH), and Newark.  This is awarded to Premier members on a space-available basis, prioritised by status, then fare class.
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