to get loads of money buy emergency stall and about 2 better models of the plane then put your plane right at the bottom of the screen but a bit back so you don't make it go backwards then when it is going up use the boost while it is facing up.You might need to stall so that's why you need to buy the emergency stall and remember to use all of your boost.It worked for me but it might not work for you.
 "Effing Machines"){kind=icon}
 "Earn to Die"){kind=icon}
 "The Line Game: Orange Edition"){kind=icon}
 "Bloons Super Monkey"){kind=icon}
 "Kingdom Rush"){kind=icon}
 "Bad Eggs Online"){kind=icon}
 "Papa's Freezeria"){kind=icon}
 "Flight"){kind=icon}
 "DuckLife3: Evolution"){kind=icon}
 "Mike Shadow: I paid for it!"){kind=icon}
 "Burrito Bison Revenge"){kind=icon}
 "Coinbox Hero"){kind=icon}