I'm gonna copy paste this in case they change the T&C at a later date

AirAsia Unlimited Pass
The AirAsia Unlimited Pass is available for BIG Members within Malaysia who are at least 12 years of age on the date of departure and the passenger must be the BIG Member who made the booking. Each AirAsia Unlimited Pass is assigned to one (1) passenger only with one (1) BIG Member account. For the avoidance of doubt, the AirAsia Unlimited Pass is not available for children aged below 12 on the date of departure.
The AirAsia Unlimited Pass is not available to be purchased by travel agencies or any parties other than individual BIG Members. In the event any travel agency or party other than an individual BIG Member purchased the AirAsia Unlimited Pass and subsequently made flight bookings using the AirAsia Unlimited Pass, AirAsia shall have the right to cancel/forfeit such AirAsia Unlimited Pass and the flight bookings, without any liability on the part of AirAsia to such agency, third party or any passenger.
The AirAsia Unlimited Pass cannot be sold, bartered, assigned or transferred to another person. Any attempt to transfer the AirAsia Unlimited Pass or book travel using the AirAsia Unlimited Pass for someone other than the holder of the AirAsia Unlimited Pass will result in immediate forfeiture of the AirAsia Unlimited Pass.
The AirAsia Unlimited Pass is only available to be purchased by BIG Members on www.airasia.com and AirAsia mobile application.
Upon purchasing the AirAsia Unlimited Pass, the passenger shall have the right to book and fly on AirAsia X and Thai AirAsia X flights to Australia, India, China, Korea and Japan for an unlimited number of times, subject to full and final payment of any applicable airport charges, taxes and regulatory fees, or other charges.
No BIG Points will be given for the purchase of the AirAsia Unlimited Pass. Use of the AirAsia Unlimited Pass will not earn any BIG Points, and flights flown using the AirAsia Unlimited Pass will not count towards any offers or bonuses. Redemption of BIG Points is also not allowed for the purchase of the AirAsia Unlimited Pass.
When purchasing the AirAsia Unlimited Pass, passengers must ensure their details in the BIG Member account (i.e. name and date of birth) are as per passport or identity card. These details will be used for booking during the redemption process.
The AirAsia Unlimited Pass is non-refundable.
Validity
AirAsia Unlimited Pass Purchase Period: 29/02/2020 – 07/03/2020
Travel Period: Travel before 02/03/2021
The purchase dates and travel dates of the AirAsia Unlimited Pass are based on Malaysia local time (GMT+8).
The Purchase Period and Travel Period of the AirAsia Unlimited Pass shall not be extended. Redemption of flight for departure earlier than the applicable Travel Period or later than the applicable Travel Period is not allowed.
For the avoidance of doubt, no refund will be given for any unutilised AirAsia Unlimited Pass purchased.
Redeeming the AirAsia Unlimited Pass
The AirAsia Unlimited Pass cannot be redeemed offline at airport ticket counters, call centres or through travel agents.
Passengers must log in to the BIG Member account to redeem the AirAsia Unlimited Pass on www.airasia.com/deals or AirAsia mobile application.
Prior to redemption of the AirAsia Unlimited Pass, the passenger shall ensure his details in the BIG Member account are correct. No name change is allowed once the first booking has been made.
A promo code will be provided for each booking under the AirAsia Unlimited Pass.
Each promo code under the AirAsia Unlimited Pass can be redeemed for round trip flights, subject to seat availability. For example, in the event a passenger purchases a return ticket, if the seat is not available on the return flight, the discounted fare generated via the promo code will only apply to one way of the journey. Passengers would need to pay the full fare as displayed on the website for the return journey. For the avoidance of doubt, passengers may also redeem the AirAsia Unlimited Pass for one way flights.
Redemptions are only valid for the base fare and do not include ancillaries, add-ons, airport charges, taxes and regulatory fees, or other charges, if any, which shall be payable by the passenger at the time of booking.
Redemptions are only valid for Point-to-Point routes and exclude FLY-THRU routes.
The AirAsia Unlimited Pass is redeemable only on AirAsia X and Thai AirAsia X flights bearing Carrier Code D7 and XJ, respectively, EXCEPT for the AirAsia X routes below (in both directions):
Kuala Lumpur – Denpasar (Bali)
Kuala Lumpur – Singapore
Kuala Lumpur - Jeddah
Booking of flights under the AirAsia Unlimited Pass must be made at least fourteen (14) days before the flight departure date.
Flight redemption is limited and subject to seat availability. A seat may not be available on every flight or day, e.g. due to high demand at times such as weekends, public holidays, school holidays, etc. The AirAsia Unlimited Pass does not guarantee availability on any particular flight. Flight schedules are subject to change without notice or liability to the holder of the AirAsia Unlimited Pass.
Passengers are allowed to book up to two (2) flights for travel on the same day. No multiple bookings for travel on the same day from the same origin are allowed. Any such bookings are subject to immediate cancellation.
Passengers are allowed up to three (3) no-shows. In the event a passenger exceeds the number of no-shows permitted, AirAsia shall have the right to cancel/forfeit their AirAsia Unlimited Pass, without any liability on the part of AirAsia.
AirAsia shall not be responsible or liable for any damages incurred or suffered by the passenger including but not limited to the following circumstances:
The passenger’s purchase, redemption and/or use of the AirAsia Unlimited Pass;
The passenger’s inability to redeem the AirAsia Unlimited Pass due to inaccurate passenger details;
The passenger’s inability to use the AirAsia Unlimited Pass due to lost or misplaced password; or
Unauthorized use of the AirAsia Unlimited Pass.
Passengers are responsible for obtaining and must possess and have available for presentation as required by the relevant authorities all entry and/or exit, health and other documents required by law, regulations, order, demands or requirements of the countries flown from, into or over.
Confirmation of redemption/booking
Flight booking is confirmed after full payment for the flight is made.
Once the AirAsia Unlimited Pass has been successfully redeemed and booking is confirmed, no changes are allowed to be made to any flight booked using the AirAsia Unlimited Pass.
In the event a passenger’s scheduled flight is cancelled, terminated, diverted, postponed, rescheduled or delayed before the passenger has reached his final destination as a result of a flight cancellation, AirAsia-caused missed connection, flight delay, or omission of a scheduled stop due to circumstances beyond AirAsia’s control or for reasons of safety or commercial reasons, AirAsia shall at its discretion, either:
carry you at the earliest opportunity on another AirAsia flight on which space is available at no charge; or
refund check-in baggage, meals or seat selections purchased and airport charges/taxes paid.
In the event of no show, AirAsia will refund airport charges/taxes paid only.
*Voluntary Refund for flights departing from/arriving in/transferring through the Republic of Korea:
In the event a passenger requests for a refund of his flight within 91 days prior to the date of departure, a refund will be provided in the form of promo codes with no cash involvement. Passenger may proceed to make a new booking in accordance with these Terms and Conditions using the new promo code.
General terms
The AirAsia Unlimited Pass cannot be combined with any other offers or exchanged for cash or any other products in kind.
AirAsia has the right to reject any claims that do not conform to these Terms and Conditions.
In the event AirAsia detects unusual, irregular, suspicious, unauthorized, fraudulent activity on the purchase or redemption of any AirAsia Unlimited Pass, AirAsi]a shall have the right to cancel/forfeit such AirAsia Unlimited Pass purchased and subsequently cancel any flight booking made using such AirAsia Unlimited Pass without any liability on the part of AirAsia to any passenger.
These Terms and Conditions will prevail over any inconsistent terms, conditions, provisions or representations contained in any other promotional materials regarding the AirAsia Unlimited Pass. In the event of any inconsistency between the terms in these Terms and Conditions and the AirAsia’s Terms & Conditions of Carriage (https://www.airasia.com/my/en/about-us/terms-and-conditions.page), these Terms and Conditions shall prevail.
AirAsia reserves the right at its absolute discretion to vary, delete or add to any of these Terms and Conditions and/or withdraw the AirAsia Unlimited Pass, or substitute or replace the AirAsia Unlimited Pass with another product or program of equivalent value from time to time without any prior notice.
By purchasing and utilizing the AirAsia Unlimited Pass, the passenger agrees to be bound by these Terms and Conditions as well as AirAsia’s Conditions of Carriage as may be amended from time to time.
The passenger agrees to hold harmless, defend and fully indemnify AirAsia from and against all losses (including loss of opportunity and consequential loss arising therewith), damages, expenses and all third party actions, proceedings, claims, demands, costs (including without prejudice to the generality of this provision, the legal cost of each other, personal injuries, death, loss or destruction of property, rights of publicity or privacy, defamation), awards and damages that may arise as a result of the use purchase of this AirAsia Unlimited Pass.
These Terms and Conditions are governed by laws of Malaysia and all disputes relating to the AirAsia Unlimited Pass are subject to exclusive jurisdiction of courts in Kuala Lumpur.