It's unpredictable, but as was mentioned, we've been losing captains and some senior FOs to the majors at a rate of about 30 a month. We've been hiring about the same, or more per month. If that continues (and with the majors hiring plans for 2017, it likely will) it will be a 2.5 year upgrade. I've been here about 9 months and with the current attrition, I have about 20 months to go to upgrade.