<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by danielonn:
TK could also mean to reconfirm the ticket 72 hours prior to the flight and it will then be changed to an OK.
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The code for reconfirm is RR, but rarely used these days. Back when you had to reconfirm international flights 72 hours prior, the agent would change the segment status from HK to RR to show reconfirmed.
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