What important travel tips should I consider when flying from Heathrow to Bangkok via Bahrain?

Travelers flying from Heathrow to Bangkok via Bahrain are advised to check in early, allowing at least 3.5 hours before the flight due to lengthy check-in processes. It’s crucial to print all necessary documents, including RT-PCR test results and Covid certificates, as mobile checks are not accepted. The importance of having multiple copies of these documents is emphasized, especially when passing through multiple airports.