No
Airports have very tight security. They are really cautious about anything like if you have a pen in your pocket.
El Al is the national airline of Israel. Has the one the best security in the whole world - fly safe.
Unless you're in the US on a green card, and have an INS-issued number you can give in place of a Social Security number, it's not going to happen. If you refuse to give your SSAN, they refuse to grant you a licence.
They taxed and they taxed and they taxed...
There is no easy answer to this question. Security varies from airline to airline and airport to airport. I can confirm this from a recent trip that I made. It's a nightmare and I'm surprised that people are still travelling!
Every country has its own agencies. In the United States of America, Airspace and air traffic control are regulated by the FAA (Federal Aviation Administration). Security is done by the TSA (Transportation Safety Administration). Airline safety and crash investigation are done by the NTSB (National Transportation Safety Board).
In order to get past the preliminary screening by the TSA (Transportation Security Agency) no - you don't. HOWEVER, there is at least one international airline (El Al, the Israeli airline) has additional and VERY STRINGENT security measures that are separate and apart from the TSA screening. In order to fly on that airline (and maybe some others) you will have to submit to whatever searches THEY wish to conduct.
None but the israeli airline has only been hijacked once in 1968 and is now regarded with the best air security and have outstanding record for catching hijackers
You don't have the authority to demand a social security number of a customer. They are within their rights to refuse that information.
Tell him to suck your 10inch di*k
The airline will inform you how early you must check in. The amount of time may vary according to the level of the security threat.
Unless he places you under arrest you may refuse. However, he may be asking you to leave because there is some nearby danger which may harm you in which case you would be a fool to refuse his directions.