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yes
Yes.
Yes Gambians need a Schengen visa to transit Germany
Which passport do you hold and where are you traveling from/to?
Yes, See the US Immigration Page for more details
flying to usa stop over in transit in heathrow-sa passport do I need a transit visa
Thai passport holder need transit visa entering Japan. Transit visa could be obtain in the airport if only at emergency like extreme prolonged flight delay or the transit flight would be from another airport. In general it would need to sort out Transit visa beforehand.
No, you need a visa
Panama does not require a transit visa if your connecting flight leaves before 12 hours is up. If you are staying in Panama for a period of longer than 12 hours and must pass through immigration, you will need a passport.
You do not need a transit visa but a passport is required to re-enter the USA
You do not need a transit visa, if you do not go out of the airport to see London or change airports at London.
Yes you will. Its the US. You need a Visa to enter or pass through the US. Only if you are not coming off the plane.