When did they announced the additional 15 CRJ900's as indicated at www.airlinepilotcentral.com?

Skywest will get another 15 CRJ900s on top of the 17 already receiving below
New MKE domicile to open, 70 crews by October
To operate between 15 and 25 CRJs for Midwest Airlines; 5-year agreement
Midwest flying to begin in April
Skywest has 17 CRJ900s on order, being delivered at a rate of 2/mo
With ASA purchase, largest RJ carrier in the USA
Will maintain separate SkyWest and ASA labor groups and certificates
SkyWest-ASA combined routemap