Niche dating websites, on the other hand, offer a separate class of services and are built exclusively to meet the needs of a particular individual. (jewishdatingsites.biz)
This is not a separate class of service, and on most airlines you can not purchase these seats with miles. (rewardexpert.com)
For now, the official line from American Airlines is that premium economy will be launched as a separate class of service in «early 2017.» (thepointsguy.com)