How to Earn more money - sell Gold planes - but how?

Hi, i have 2/3 gold planes after a week of playing the game, can i “sell these” , to earn more money to develop my airport ??

if so, how do i do this ?
ta

you can transform golden planes into money with the shopping cart item on the top left corner of your screen

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thanks mate

You can earn Gold Planes by lots of things (Achivements, Connections etc.) another way of earning it is buying ATRs and Selling them.