Wirelessly posted (BlackBerry9630/5.0.0.591 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/105)

Keep in mind that the "promo" and full biz seat numbers you note above are not necessarily additive. Most likely is that the flight inventory is C4 D4 which means at least 4 seats but not necessarily 8 for sale.