A friend of mine works on cruise ships, and has a C-1/D visa for that purpose.
She now wants to fly to the UK to visit us, and the best ticket prices involve getting a connecting flight in the USA, some of them with a layover.
I've searched and read everything I can find but I can't find anything other than vague answers. The question is:
Does the C-1 part of her existing visa cover her for transit in this scenario? Or does she need to apply for a separate visa to cover this journey?
She's a Mexican national and resident, so not eligible for a waiver.
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