Should I fly to Newark Liberty, LaGuardia, or JFK?

I'm flying to New York City in about a month. We're currently planning everything and it's going great. But we have one thing yet to decide, which airport should we fly to? We're flying with United and we've heard that Newark Liberty is great airport for customers of United, but we've also been to LaGuardia last year, and they were also great. We've never been to JFK, so anybody got any ideas?

Why was I patted down at the airport?

So this happened at the beginning of march but it still really bothers me. I was at the airport with my dad and for literally no reason they said they needed to pat me down. Then they asked if i was comfortable with my dad being in the room (cause he asked that it would be in a private room [i have anxiety]). And then it happened and it took forever, at least it felt like forever because i was silently having a panic attack (i HATE people touching me). Then we missed our flight because of it. And I'm kinda traumatized.
What? Was? That? For?
(I'm 15 btw)

I'm confused? Need help with travel question?

I'm planning to travel to a foreign country soon. I have bought the ticket already. I live in the USA. I have bought the ticket online and it is a one way ticket. I'm going to buy the return ticket when I'm in that country and ready to leave which may be in a few months after my arrival. My question is do I have to pay for the return ticket in USD or do I have to pay for the return ticket in that country's currency? I will be paying online from the airline's website.

Do airlines have to show a safety demonstration before a flight?

My Qatar Airways flight was delayed 1 hour 30 minutes from Heathrow because a detained man being deported was put onto the flight. I was 2 seats to the left of him and his security at the rear of the plane. Once he was on and secure we starting taxying. We didn't get a safety demonstration by the crew and neither was a video shown on the screens. Was this legal?

Airport security question?

I was asked by a customs officer. If anyone had packed my bags or put anything in my bags without my knowledge? How do you give an answer too that? Hes basically asking if I know something that I don't know? Right?