EDIT as of 0600GMT 01AUG20: Additional update provided by the airline.
AirAsia X in the last few days closed reservation for all flights, including all travel dates in 2021 (at least until 30OCT21, as flight listing is not filed on/after 31OCT21), as the airline lists flights “unavailable” or “sold out”. As of 0030GMT 01AUG20, AirAsia X’s D7-coded flight numbers is only available for reservation on Kuala Lumpur – Taipei Taoyuan route, on 13AUG20 and 29AUG20.
The airline has advised the closure of reservation is on temporary basis, and will re-open in the next few weeks, pending on market condition and further development on travel restrictions.
D7378 KUL0730 – 1220TPE 330
D7379 TPE1330 – 1815KUL 330
The airline previously intended to resume scheduled operation today (01AUG20) on Kuala Lumpur – Taipei Taoyuan route.