Here is my experience - long time and several attempts/walk in's to get the written invite:

Applied: 10/26/2015
Written invite: 8/05/2016
Written submitted: 8/12/16
Interview invite: 9/02/16
*Interviewed 12/02/2016 @ White Plains NY
Preferential "Offer" 12/09/2016

3 years at a 121 Regional in the EMB-145 ('06-'09); last 8 years at a 91 as a US Govt GS-13 in the DHC-8.

I had to pass up a Sept 29th interview invite; lost about 20 positions or more of seniority - but I don't think that will be much of a factor with the rate people are leaving. I have 2 friends there who are happy and hopeful for better days ahead.

If for no other reason, the potential to move into a leading major is strong...if Amazon feels the pinch, it may be the leverage the Pilot group needs. Before anyone craps on my post - I'm focusing on being happy in my choice to transition. That whole positive attitude thing - I want more time to fish and run my small business on the side...govt gives me 6 days a month off at most.