Envoy FO bonuses:

* $7,500 in 2015 (concessions)
* $7,500 in 2016 (no concessions)
* $15,000 in 2017 (5K concessions + 10K no concessions)
* $2,500 in 2018 (no concessions)

Hopefully, most FOs will upgrade by 2018. The real retention tool is upgrades.