Easy. Purchase a ticket, It will give you a terminal number and maybe even at gate number if you don't get a gate number on your ticket you can look up your flight information from the information booth Or from flight information monitors
Will i be able to fly to detroit airport from jfk international airport
You can book online, (www.flights.google.com might be a good place to start), or with a travel agent. Once you have your reservation, it should come with all the info you need. That's pretty much all you need! Oh, and don't forget to actually fly...! ;)
Should i catch domestic flight from in side the jfk international air port other waise texi?
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