You get VIP Status by paying a monthly fee. The best thing is that you will receive rather many crystals for this price, 300 upfront and then 40 per day – in total 1 500 during one month.
You also get some discount on purchases, the possibility to use an extra overdrive per flight, and one free revive per day.
When also purchasing crystals, you will achieve higher VIP, like VIP 2, VIP 3, etc, which all bring som small perks. If you do this, and you pay the monthly fee as well, there are some more perks.
We say it is worth paying the monthly. But that is of course completely up to you, and it should be stressed that the game if very enjoyable also without paying a single cent.