Dawn to Dusk is what I was thinking of too. When AerBabe and I did the challenge we visited 7 in one day (I think, but I don't have the paperwork to hand to check, so AerBabe might correct me). We overflew another 3 which we'd planned on landing at but couldn't for one reason or another. Quite a way off of 45, but we did include 3 countries in our trip which I reckon makes up for it!
FFF
---------------