Other than missing out on Concorde, I don't have too many gaps in aircraft types from the 80s onwards; with BA and its predecessors I have flown on the Viscount, BAC One Eleven, Trident 3B and Tristar, for example. On my wish list is LHR-SCL, for some reason it seems to be really hard to get redemptions on that one and I don't fancy being down the back! Elsewhere, something across the international dateline, so round the world, I guess.