When you get this answer on Mozambique flying:
"Take cash! And on the issue of cash:
If you are going to take US dollars, make sure you take lots of small bills (they never have change),
Do not fold the money (if it's folded they don't take it), 
and lastly,
Make sure all the US dollars are newer than 2006 (they don't take Dollars older than 2006)!"