What is the purpose of raising a new squadron and transferring old birds to it?? Why wasn't a new J-10 squadron raised instead??
How many mirages will be in this new squardon?
A long tradition... Whenever a new aircraft is procured, it goes to the parent squadron of the present CAS... In this case, 15 squadron.
One thought is that you stand up an additional squadron with older aircraft, once new ones (be they JF-17s or J-10s) are available, retire the old ones and re-equip. In this way you have the manpower, support, logistics required for raising a squadron already in place. The only thing new is the re-equipping part. Since we don't have sufficient new JF-17s available for another squadron, consolidating surviving Mirages and eventually phasing them out via this new Sqn makes sense.