It's easy to get confused - there are a lot of yellow airplanes flying around!
DHK - DHL Air UK - 757/767/777 (EMA)
DHA - DHL Air Austria - 757 (LEJ)
DHX - DHL Aviation Bahrain - 767 (BAH)
EAT - European Air Transport - 757/A300/A330 (LEJ)
plus a lot of others working for them like Southernair, Kallitta, Atlas, Aerologic, ASL, Air Hong Kong etc etc...