Continental Airline Tickets - how do I find if someone took a airline flight?

how do I find if someone took a airline flight?

wanting to find if someone took a flight in the last few days

You can't. It's a violation of Homeland Security Regulations.
You'd have to ask them. The airlines do not release that information for security and privacy reasons.
Why who are you stalking?
You have to contact the passenger themselves, airlines do not release that information to anyone other than the passenger or credit card holder who purchased the ticket.
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yep, my mom's a res agent at US Air, and she couldn't even give the info to a translator who was calling cuz the client couldn't speak english. However, she always looks up people she knows, cuz she's a sick stalker