FlyerTalk Evangelist and Ambassador: The British Airways Club
Join Date: Jun 2008
Location: Somewhere between 0 and 13,000 metres high
Programs: AF/KL Life Plat, BA GGL+GfL, ALL Diam, Hilton Diam, Marriott Gold, blablablah, etc
Posts: 33,186
Of course it's not possible. You can't have a single booking with two sets of passengers booked into different classes, that requires two separate bookings. A space release applies to one booking, ergo, each booking will need its own space release unfortunately.