Well I couldn't find a FedEx flight 522, but there were two flight 5225 that day:
Contacted [UTC] Callsign Flight Routing Reg
2013/05/30 01:09 FDX5225 FDX5225 EDDK-KMEM N884FD
2013/05/29 19:45 FDX5225 FDX5225 EDDK-KMEM N884FD
2013/05/29 19:36 FDX5225 FDX5225 EDDK-KMEM N858FD
2013/05/28 02:42 FDX5225 FDX5225 EDDK-KMEM N862FD
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