tipe of plane that have to be keep till the end

Hi, right now I'm in level 32 and have 8 hangar, 1 prop, 1 turbo, 4 jet and 2 delta..........
Do we have to keep old plane such prop and turboprop for next level??
and at the end (level 35+) have we make all jumbo in our hangar??

Tumbuang,

based on my experience (in the previous game), later on, there will be quests that will need us to go to places that we might forget it existed :p so long ago that we dont have the plane to go there anymore.

(remember this 'stadium/football' quest? how do you think it would work if you only have jumbo on your hangars? hehehe..)

Usually, when we are already in the much higher level, money wont be too a matter anymore. What I did was, I have the jet and delta (I wasnt in jumbo yet at that time), and I only keep 1 turbo. Just in case I need to go to short distance places. I could 'easily' change prop & turbo whenever it needed. Sell it and buy the other type, vise versa.

Yet, later later on, I will just keep 1 jet. Others will be delta & jumbo.
And the Jet will do the shuffling between prop/turbo/jet whenever it needs to...

OR..
if you are already in the level of having millions and millions of coins at your disposal..., well.. it wont matter how often you change you plane types, right? :-)

Thanks for your opinion bro.............
I got it......