Carry four people to repopulate the species
Carry 200 people to maintain the countries
Carry 5,000 people to preserve the cultures
Build your first airship and make it fly... or fail to fly.
Build a Squad of 10 airships!
Build a Fleet of 40 airships! America is strong, but you have more airships operating than them!
Carry 7,000,000,000 people to save the entire humanity
Build a collection of 500,000,000 airships! On average this would occupy more than 1TB disk space, get a new disk!