i can easily see UPS introducing a similar program as the US automakers.
http://www.autonews.com/article/20140217/OEM01/302179958/fat-profits-put-2-tier-pay-on-uaw-agenda
http://www.autonews.com/article/20140217/OEM01/302179958/fat-profits-put-2-tier-pay-on-uaw-agenda