Maybe not the place for this question but here goes.....Finally given up on hoping to get vaccinated here. Next week I fly to NYC via Ethiad. I am 71 and survived stage 4 cancer so although not paranoid I would like as much “ space” as possible on my flight . I would never fly business class ( before Covid) and my ticket next week is economy.......my question.....once I get to the airport can I upgrade the portion of my ticket going to USA.....once vaccinated economy is fine by me. When booking upgrading only half a flight was not an option. Does anyone have factual knowledge of this possibility? ApprecAppreciate your feedback.