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I’m guessing you started playing not so long ago. Should be at INN, maybe already unlocked BRI… If that’s the case, I’d use my first GP (Golden Planes) to buy the premium passes, not to buy airplanes!
The first airports are way too simple to build a fleet on them… so, I’d focus on levelling them to get to the next ones for free, just by reaching the required level.
When you reach IAD (4th airport), buying the A21NY (C plane) may be a good choice. IAD is the most optmized airport for C planes, and sending lots of A21NY as far as possible will net you LOTS of Siver Planes, which in turn you can convert into GP! -
If you play many hours straight and have to wait to play in your currently unlocked airports, you might buy SXM for 4GP to open a new path for unlocking new airports. If not, I’d keep levelling your already unlocked airports until you unlock the next one for free, and save the GP for the premium passes.
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Yes. In fact, it’s the most important use for SP in the game. Until you have a steady source of SP, saving the 10k SP and converting all at once is much better then converting 1.500SP into one GP every day (because of the +50% bônus). Once you reach IAD, you’ll have enough SP to convert both as soon as the timer resets, netting you up to 17 GP per week if you convert it everyday at the same time.
If you want some tips on how to gather more SP, check this guide: