3. Program Earning Period: For Base members, A+ Rewards credits are valid for 12 months after the date on which they were posted to the member's account. For A+ Visa cardholders and Elite members, A+ Rewards credits are valid for 24 months after the posting date. Twenty-four month expiration period for A+ credits is valid only for A+ credits earned after an A+ Visa account is established or after Elite status is attained. A+ Rewards credits will be posted within three days after a flight is completed.

3. Do my Mileage Plan miles expire?

Mileage Plan miles are "immortal" and never expire (subject to member's account remaining active for 2 years). If no mileage is credited to an account during the first nine months after it's opened, or if an account is inactive for longer than 2 years, Alaska Airlines may close the account, delete any mileage balance and reassign the Mileage Plan number. Deleted mileage can be reinstated for a $75 fee for up to 1 year. Activity in an account includes redeeming a Mileage Plan award or accruing mileage in the Alaska Airlines Mileage Plan Program.

7. Account and Mileage Expiration
Mileage Plan Miles do not have an expiration date and may remain in an active account indefinitely, provided that the Mileage Plan Program has not been terminated pursuant to these Conditions of Membership. Activity in an account includes redeeming a Mileage Plan award or accruing mileage in the Alaska Airlines Mileage Plan Program. However, not withstanding any term to the contrary, if a Mileage Plan account is inactive for 2 years, Alaska Airlines may close the account, delete any mileage balance and reassign the Mileage Plan number. Deleted mileage can be reinstated for a $75 fee for up to 1 year. To reinstate a mileage plan account please contact Customer Care at 1-800-654-5669.

AAdvantage members must have mileage earning or redeeming activity once every 18 months in order to retain their miles. Miles will first expire under this 18-month policy on December 15, 2007. If your account has no qualifying activity in any 18-month period, all miles in the account will expire except for those miles earned prior to July 1, 1989 in accounts established prior to January 1, 1989 whose mileage credit will not expire. Each qualifying activity extends the expiration date of all unexpired mileage credit in your account for 18 months from the date of the qualifying activity. Qualifying activity is defined as redeeming any AAdvantage award or accruing mileage credit on any eligible American, American Eagle®, AmericanConnection® or AAdvantage airline participant as well as accruing mileage credit with participating hotels, car rental companies, credit cards, telecommunication providers, and other service providers offering AAdvantage mileage credit.

Mileage Expiration
Miles currently have no expiry date; however, Continental Airlines reserves the right to impose expiry limits or terminate the OnePass program, thus terminating your ability to claim rewards.

Inactive Membership
If no mileage is deposited in your account for 18 consecutive months, your membership may be cancelled, and your miles may be forfeited.

Accounts with no activity for 12 consecutive months after enrollment will be deleted. A new SkyMiles number can be obtained by contacting Delta.

Currently, miles will not expire as long as you participate in one of the following activities at least once every two years; mileage expires midnight Eastern time (-5 GMT), 24 months from the date of the last activity: [earn, redeem, or buy miles]

Mileage in a Member's account will not expire so long as the Member generates accrual or redemption activity in the account. Unredeemed mileage accumulated in a Member's account will expire at the end of the second calendar year after the last accrual or redemption activity date. For example, mileage earned during the year 2007 is valid until December 31, 2009 unless the member has accrual or redemption activity in the interim. Membership in the Program is terminated if the member is inactive for three consecutive calendar years.

25. Awards will expire one (1) year from date of issue ("Expiration Date"), and in the case of Awards provided by a Participating Vendor, on such earlier date as go!'s contract with such Participating Vendor for the provision of Awards expires.

26. The expiration date of a wholly unused Ticket Award for travel on go!, or another carrier, expires one (1) year from the date of the original ticket issuance, and will not be extended. Expired Ticket Awards have no value and cannot be reissued nor miles be re-deposited into the member's account.

Conditions of Membership
5. If a Member fails to earn any miles for eighteen (18) consecutive months, Hawaiian will expire any accrued mileage on the member’s account. Expired miles may be reinstated for a fee.

5.1 Except as may otherwise be provided for Holders of the JetBlue Card from American Express as set forth in paragraph 7.4, POINTS EXPIRE ONE YEAR AFTER THEY ARE EARNED AND TRUEBLUE AWARDS EXPIRE ONE YEAR AFTER THEY ARE ISSUED. Award Travel must be booked for travel available at or before the time of Award Travel expiration.[...]

7.4 The expiration date of all TrueBlue Points in TrueBlue Membership Account's for Holders of the JetBlue Card from American Express will be extended to be 1 year from any date you have a TrueBlue point credited to your TrueBlue Membership Account from one of the following activities: (1) Using your JetBlue Card Account for an eligible purchase (as defined in your American Express Cardholder Agreement), or (2) flying a JetBlue flight segment that is paid for with your JetBlue Card Account. Eligibility and timing are based upon the date the TrueBlue point is credited to your TrueBlue Membership Account from one of the above qualifying activities.

Mileage in a member's account will not expire and will be available for award redemption and other benefits as long as the member has qualifying activity in his or her account during any consecutive 36-month period.… Miles posted to a member's account for enrollment in the Program or through an exchange or transfer with a Program Partner will not be considered qualifying activity. All mileage in a member's account will be deemed expired and not valid for award redemption or other benefits if there is no qualifying activity during any consecutive 36-month period. Accounts without qualifying activity in the first 12 months after enrollment may be deleted.

3. WorldPerks miles have no expiration date. However, consistent with the general terms and conditions of the WorldPerks program, Northwest Airlines reserves the right to change the WorldPerks program at any time without notice, including imposition of expiration limits or reactivation fees. If no mileage from any source is posted to a WorldPerks member's account for three consecutive years, the account is subject to termination, including forfeiture of all accrued mileage.

2. An Award will be automatically deposited into your account once your 16th credit posts to your account during any consecutive 24-month period.

5. Each credit is valid for 24 months from the date earned. Your Rapid Rewards account will contain only valid credits collected within the immediately preceding 24 consecutive months. If a credit is not applied toward an Award within 24 months of the date earned, it will be deleted from your Rapid Rewards account balance. Southwest Airlines reserves the right to cancel the membership of any Member with no credits in the account and who has earned no credits for at least 12 consecutive months.

12. All Awards are valid for 12 months from the date of issue. Southwest Airlines is not responsible for and will not replace lost, stolen, or destroyed Awards.

FREE SPIRIT Miles will expire when an account becomes inactive for a period of 6 months or more. An "inactive" account is one that has less than 2,000 miles credited to it from any source during the preceding 6 months. Accounts will become inactive during the month end reporting process, which will be reported to the member on the second business day of each month.

Earning Ufly Rewards Points

9. Points will not expire as long as you the member earn points or redeem points within Ufly Rewards at least once every 3 years.

9. Any member who has failed to earn mileage for a calendar quarter may, at United's option, be excluded from receiving newsletters, statements, correspondence or other materials, including notifications of Program changes or special promotions, until the next quarter in which he or she earns mileage. Any member who fails to earn mileage during the first twelve months after enrollment in the Program may be removed from the Program.
10. Effective December 31, 2007 miles will expire if there is no current activity for 18 months consecutive. Therefore if the expiration date on your Mileage Plus summary is December 31, 2007 or after, your new expiration date will be 18 months after your last activity. [ … ]
11. "Account activity", for purposes of these Rules, shall be deemed to occur when a member accrues mileage in his or her account in any manner set forth in these Rules, or as otherwise approved by United, or when the member redeems any Mileage Plus or partner award by the use of mileage in the member's account.

Reactivation policy

Since January 31, 2007, active membership status is based on having earned or redeemed miles within a consecutive 18-month period. Miles are subject to forfeiture if no miles have been earned or redeemed within a consecutive 18-month period.

Your membership account will be activated by flying a Virgin America flight where you earn points, or by any other method authorized by Elevate for earning points. If you do not activate your account within 18 months after enrollment, your account may be considered inactive. Once activated, your account may become inactive if you fail to earn or redeem any points during a period of 18 consecutive months.

your FREE SPIRIT miles can expire. If you have less than 2,000 miles posted to your account from any source during the previous 6 month period, miles older than 6 months will be expired. Because the FREE SPIRIT program calculates your status on a monthly basis, any miles that will expire will do so at the start of every month. If you want to keep your miles, get a FREE SPIRIT MasterCard and make just one purchase per month - then your miles will never expire.

Credits expire one year from their date of posting in your account.