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you should save it as you complete all flights/stars upto jumbo. you do not need extra fuel or passengers.

Once you have reached level 11 control and have 13 hangers of giants, falcons and up, you will find you will be grateful for the extra fuel and passengers.

you can easily go through 600 fuel units and over 5000 passengers in a 12 hour period.

Fuel you can easily regain as you can regain enough fuel in 90 minutes to refuel a couple of planes but passengers are not that easy to regain, the building that produce

high level passengers take a minimum of 4 hours to restock.