Totally off the topic of Mesa/-200's/growth, but someone asked about this awhile back....
Evidently all 7 October PDT lease returned aircraft are still available and haven't been placed yet. Here's the leasing company site:\

Avmax Group Inc.: Aircraft

Back on the subject of -200's/Mesa/growth, on that page above where Avmax states 3 DH2's will be available in May 2010, those aircraft are former Mesa and PDT both, 988, 989, and 991HA respectively. This concludes your useless trivia for the day.