Overwhelmingly, the interview for an American airline is majority focussed on the "No D!ckhead Policy" Can I spend 4 days away with you and get the job done. They do expect effort in knowing some basic US airspace and procedures surrounding the interview pack they send you. When you learn the alternate requirements for FAA/US you will scratch your head and say "Is that it??"
You WILL NOT need to spend money on pinstripe prep (unless of course you are interviewing for the airline they are associated with). aviation interviews is the go.