Offer valid for qualifying travel between May 18, 2006 and November 15, 2006. Offer is valid on all published qualifying fares. Roundtrip travel is not required. Offer is not combinable with other offers. Offer may be earned an unlimited number of times. Offer valid on qualifying paid published fares booked online at united.com between May 18, 2006 and May 31, 2006. Travel booked via sources other than united.com are not eligible to earn bonus miles from this promotion. Bonus is not retroactive to reservations booked prior to May 18, 2006. Registration prior to travel and before midnight, CDT, May 31, 2006 is required. You may register at http://united.com/doublemilesoffer. This offer doubles the base flight miles earned. Not valid on government fares. Valid only on flights operated by United, United Express® or TedSM and not on United-marketed code share flights operated by other carriers. Must be a Mileage Plus member to participate in the offer. Flights must be credited to the Mileage Plus account in order to qualify. Bonus miles apply to base flight miles only and do not count toward elite status. Bonus miles are in addition to any applicable elite or class of service bonuses. Offer subject to change without notice. Other restrictions may apply. Miles accrued, awards issued and bonus offers are subject to the rules of the United Mileage Plus program. Bonus miles will be deposited six to eight weeks upon completion of qualifying travel. The Mileage Plus Program, including accruals, awards and bonus miles offers, is subject to change without notice. Taxes and fees related to award travel are the responsibility of the passenger. United and Mileage Plus are registered service marks. For complete details about the Mileage Plus program, visit www.united.com.