As far as I know, and I use to fly in Colombia for 17 years, Colombian registration is "HK" and one, two, three or four numbers, depending on the year that was registered, allways followed by a letter... just one...
W- for executive or charter, P- for private, I-for schools and some others that I don't remember...
Unless DHL has being granted special regs, I never saw more than one letter on the regs...
And if the aircraft on the picture in registered in Colombia, is Illigal, cause they require the reg. to be painted on the bottom of the left wing, the top of the right and the tail..
Correct me if I'm wrong ... been a long time out of S.A.
Keep it safe
