Yes. Airlines may check your UK ETA status before you board a flight to the United Kingdom.
Travelers who need a UK ETA must have an approved UK ETA before traveling to the UK, and airlines may check the ETA status using the passport information during check-in or boarding procedures.
Therefore, if you plan to take a flight to the UK, it is recommended to check your UK ETA approval status before going to the airport.
If you are preparing for a trip to the UK, please apply for your UK ETA before departure.