Aircraft expected to be leaving the fleet in 2026:

Airbus A350-900s
HS-THQ and HS-THR are both expecting to have their leases end this year and will go to Edelweiss Air, as these two were always intended to be on a short term lease with THAI.

Boeing 777-200ER
HS-TJV and HS-TJW are the last 2 remaining 777-200ERs while they were expected to leave this year, this could be pushed back due to need for additional aircraft. Remains to be seen if they will finally be retired in 2026 or if they will stay on.

Boeing 787-8
HS-TQC and HS-TQD are both expected to leave the fleet this year as their leases end, both are expected to go to LOT Polish Airlines.