Originally Posted by
PikeAV8R
When or where do you pay the taxes if you jumpseat?
"They" will direct to you the right place. Go to the ticket counter to sign up and go from there. Typically there is a separate Service Counter that handles that stuff adjacent to the ticket counter. Pay the fee, get the receipt and wait to be cleared - just like a non-rev. Remember unlike domestic, you will be cleared on at the ticket counter - as opposed to the gate. The reason is, you will need a seat assignment and boarding card before you can ever proceed through security and customs. It actually makes it a bit less stressful as they typically start clearing non-revs 40-50 mins prior.
The only exceptions are when transiting an International Gateway like NRT. You may be able to proceed to the Transfer Desk inside security and customs and cleared from there. Ask, and go with the flow.