172driver
A cross-Africa flight.
West side including across the Sahara.
OK, we're getting somewhere (must say, I kinda liked the 777 with one donk switched off suggestion
!)
Now, Africa, west side, you'll run into the Avgas issue. However, this is doable with some planning. If you can lay your hand on one, I'd suggest a C210 with the tip tanks (endurance
AFAIK +/- 10 hours) and pre-positioned fuel. You'll be fine into mid/southern Morocco, then you'll need to organize the drums. Mate of mine did just that - PM me for his details. Avgas is avail again from Namibia on, possibly (need to check) Cameroon. Also, in a 210 you can land pretty much anywhere, and there are maintenance shops along the way that can fix things.