This may be a simple and stupid question, but I saw an interesting tag one time while tracking flights out of ORD. The call sign was simply "DUFFED" even though it appeared to be a normal flight on a regional jet. I was interested in this and followed it for a while. Eventually, it was updated with actual information, but I was never sure why it said DUFFED. Does anyone know why this happens? This was on the old version of the Windows Phone 8 app. I didn't have a chance to get to a real computer to double check this when I saw it.
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