For pilots hired today, that's a toughy. There are some predictions that a whole slew of FOs they hired since 2013 are not eligible for upgrade yet, but that remains to be seen. All the captains needed for currently announced growth are already on property and have been since early to middle summer. Rampant rumors of more airplanes coming but again, that remains to be seen. Although the junior CA is a 4/13 hire, they've hired 300 pilots since him. The longer the ineligible FOs are on property, the closer they get to being eligible. Most of the pilots hired into the EJET are prior 121 so most of them are eligible right now and are just waiting for seniority.

Increased attrition and/or more airplanes would obviously improve the chances of a quick upgrade quite a bit.