Day 5: 11:00 A.M.-12:00 P.M. - S5-E5
Factual error: When Mrs. Logan escapes, Aaron Pierce refers to her as "the First Lady" over his radio. The Secret Service has code names for each of the members of the president's family. He should have used her code name when communicating to other Secret Service agents about her.
Day 5: 1:00 AM - 2:00 AM - S5-E19
Factual error: When Chloe is at Bill's, she brings up the details of the diplomatic flight, and it shows the aircraft as a Boeing 757-200. This is a twin-engine aircraft, but the one shown is a tri-jet.
Answer: According to Jack in season 5, Nina was "deep cover" before the pair ever met, so it's safe to assume she was recruited before she joined CTU. As for what her primary mission was, who knows? Perhaps it was to gather sensitive intel and pass it on to her superiors. Given that she worked for an intelligence agency, it's not a stretch. Or perhaps we may find out in season seven.
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