Ok to Board, or OTB, is often a travel clearance requirement for certain travelers, especially when traveling to the UAE or other countries in the Gulf. It simply means that a carrier pre-verifies a traveler's visa, processing the verification and updating it in their system, thereby clearing them to board the airline. Once your visa is verified and your flight carrier updates the OTB status, you can board the flight. You must always check with your airline ahead of your trip so that you don't have any problems at the last minute due to unconfirmed OTB status.
>https://omanievisa.com/blog/oman-visa-ok-to-board
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