I see no grounds for a lawsuit based on what you posted.

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THe why is irrelevant. Lawyer up, and quit posting about it on the Internet.

You must be 18 to use this site. Talk to your parents.

Probably nothing. Your agreement with the airlines likely limits your recovery, if any, to the cost of the ticket.

Not sure what you mean by "what if?" Your PO is the boss. You can complain to their boss if you want a new PO, that is unlikely to end well.

You can't. They don't want you in their store. That is their right.

You are incorrect. This is perfectly permissible.

This is not a matter for the courts. You will not win and you will spend a ton of money pursuing it.

If he sues you a judge will decide whether it was a gift. If it was, it is yours to keep.

Nothing in your post gives rise to a lawsuit.