"If you are a B737 Captain or First Officer in IAH, EWR, CLE, LAX or GUM that does a straight pickup after the issuance of this bulletin of a full trip pairing from open time that originates on March 17, 2012 through March 25, 2012, that pickup will be treated as a “voluntary junior manning” (VJM) event and you will be paid a minimum of 4:30/day or flight time flown, whichever is greater, at 150% of your normal hourly rate."

So far, March 9th to March 25th (and Jan 1st and 2nd).