Pakistan Space Agency
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I have noticed the same discrepancy in my pictures for the JF-17. Cant explain the reason really, that would be up to Kamra I suppose.
For the 15-206 vs 16-206, the latter is the correct number.
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You can see 15-206 tail number here as well on and aircraft without any squadron markings. Its not the case of a paint job but might rather my speculation is it has something to do with which year the airframe actually entered service, not necessarily finished production? These few jets might have overlapped 2015 and 2016 and the year corrected accordingly.
You can see this happen with the K-3E as well where the year on the serial number updated from expected year/date of service to actual service entry. Here is an example of what I am talking about.
View attachment 589493
View attachment 589494
When you say "entered service", do you mean when the aircraft is physically handed over to the air force and assigned to a squadron or whenever it's assigned on paper?