Yes, quite aware, and it's been more than a few years. Easy 10+ years they've been doing this...but I haven't received one in quite some time - nor have I seen the purser hand out an entire stack on a flight. Just received another one on my SAN-SLC flight today before landing, along with at least 15-20 other passengers. 2 days in a row? Eh...I'd suspect something more is up here. It reminds me of when their handheld device would alert them to personally thank passengers for their loyalty, and a sure fire way to get a "thank you" was to have a complaint or flight issue/disruption previously. Haven't seen that in pop up in awhile.

...and yes, I know they just see the MM status, but I'd expect the note to say "Thank you for being a million miler" or "We appreciate your million miles" - not "Congratulations on becoming a 1 million miler! This is a huge milestone!" as the first line of my card. I know I'm being snarky, but I found it funny, and to me it does imply being somewhat recent. I just thought it was funny, knowing I'm about 40K away from 2MM, but no shade whatsoever.