The first Qatar Airways flight from Doha to Cardiff (QR323) on Tuesday 1st May is scheduled to be on A7-ALU, A350-941XWB.
This particular aircraft is brand new, being delivered to Qatar only a week ago on the 24th April 2018. Since then it has been to Malé twice, Amman, Kuwait, Geneva and Zurich.
It is configured with 36 Business Class and 247 Economy seats. The B787-8 aircraft which will be used on the route going forward will have 22 Business Class and 232 Economy seats.