Delta Is Reciprocating My Loyalty, or am I lucky?

9 out of my 13 flights so far this year with Delta have been upgraded. 5 of them to first class. I only buy main cabin tickets..

Lucky, or Loyalty being reward? — I’m only silver medallion.

I see a lot of people complaining about no upgrades etc. The flight I have tomorrow I got a first class upgrade again for myself and a companion traveler (on a linked booking not even directly booked with me). 16k miles for the ticket and got upgraded to first.. I feel lucky at this point.

Im sold on delta being the best program. I’m Mosaic 2 with jet blue and have never been upgraded to anything. (I also have Delta Amex Plat)