I'm an offline guy looking to JS from NYC to LHR and back early next month on UAL and/or DAL. I've done a search but most of the threads are more than a year old.

On UAL out of EWR and Delta out of JFK, where do I go to make sure I get listed on the Gen Dec and JS? Ticket counter? Someplace else? Do I need to list ahead of time (before getting to the airport)?

Same question(s) leaving LHR. I know I'll have to pay taxes of around $200 leaving LHR. Where do I pay and must payment be made in cash?

Any other advice specific to international JS procedures on UAL, DAL or LHR is appreciated.

TIA.

Tipsy