Well I'm not American, although I travel to and within the US a lot. In the country where I was born and which issued my passport, there is no connection whatsoever between first and given names. In fact, almost everybody is called by their second or third forename. Whilst official records keep track of our given names, passports do not specify them, but they do list all our forenames in full. In my case, my given name is my third forename. I have absolutely no desire to be called by my first name, which I don't consider mine at all, but my grandfather's. I have always travelled under my third and given name without any problems, apart from one or two INS morons who took it upon themselves to cross out my given name on the visa waiver form and replace it with my first name. Is Secure Flight likely to create any problems for me travelling under my actual, third name, carrying a passport which lists all my forenames?