Hi Ron - We used CityMD, 48 hr antigen test. Last leg of flight was at 10:30 am on a Saturday, so we went Thursday at noontime. If you go there, tell them you must have it TIME STAMPED and wait for a printed copy of the results. It took about 15 min. Look over the results to make sure all the pertinent info is there that you need. EZPZ. Good luck! Enjoy your vacation!