It cannot have been a single formation. The Su-30's and Mirages were patrolling in two separate places. The Mirages in the fly past were not the ones used during Feb 27. They were part of the group that attacked Balakot. I think since they flew during the flypast with the Su-30's used on Feb 27 people got confused.Kartik wrote: What could have happened is that they may have been upgraded since the Feb 26th mission.
But the Avenger formation was the formation of Su-30MKI and Mirage-2000I fighters right? No.9 Wolfpack squadron might have had a mix of upgraded and non-upgraded fighters..the non-upgraded ones were used as Spice-2000 carriers, whereas the upgraded Mirage-2000Is were used for BARCAP missions the day after.
The "Avenger" formation is basically the 2 Su-30's which evaded all those AMRAAMs without a scratch. The 2 Mirage-2000I's which engaged the other Paki formation of JF-17's and Mirage-5's were not part of the flypast as far as I can tell.