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Old Nov 16, 2010 | 2:05 pm
  #10  
tev9999
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I never understood why Northwest often used DTT on tickets (not sure if Delta still does). It consists of Detroit Metro (DTW), Detroit City (DET) and Willow Run (Ypsilanti - YIP). DTW is the only one with commercial service for many many years.

I find matrix.itasoftware.com better for searching as you can input multiple unique airport codes.
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