My coworker figured he got it since he hadn't flown today ... he did fly yesterday and three other times in the past week though ... why else would they miss him?

Edited to add: I just checked my coworkers account and he also got the offer to buy 5-7 BS tickets get one free promo award, buy 8 or more and get two free promo awards. If he was a glutton for punishment (and didn't have more awards than he could use already anyway), he could do an award run MCI-STL, be about $1,000 and he'd get 8 segments, 26 credits (1.25 + 2 for each flight), and 2 promo awards, not a bad deal, especially if the person needed some credits for CP (which increases the value of the earned credits).