I have a VS flight from JFK to LHR. I used miles on a separate ticket with Delta to get to JFK but booked directly with Virgin Atlantic for their flight. I’m going to try to get Delta to book our bags through to London from when I check in with Delta. Assuming that works (it should), do I check in online with Virgin? Check in at JFK (can I do plane side) and tell them bags are already checked? Who reviews passport etc.? Trying not to have to check bags at JFK or go through security again.