How noisy depends on the type of airplane. pos malaysia 4am departure for certain would wake up light sleepers.

No doubt could reduce noise substantially. however, noise still could transmit through roof.

Here's an example...

1) Developer A build a house that has a price of RM1 million.
2) Developer A (mostly all developers in Malaysia) does offers 10% discounts for new house. Extra 7% if you're bumiputra.
3) From point #1, this brings the house net price to be calculated as below;

(House price)-(discounts)
RM1,000,000 - RM100,000
= RM900,000 <---- This will be the house's NET price.

4) However, in your SPA, developer always put the house's price before any discounts. In this case, it will be RM1,000,000 <---- This price usually called SPA price (because this is the price that you see in your SPA)
5) Banks usually offer financing loan maximum up 90% of SPA price. And NOT 90% of discounted price.
6) Therefore, if the bank offers you 90% loan amount, you will get;

90% x (SPA Price)
90% x RM1,000,000
= RM900,000 <---- This will be the loan that bank will give you.

So, you notice that the loan that you get from bank is the same as your house's net price. In a way, bank will release this money to developer and since RM900.000 already covers the house's net price, you don't owe developer any money. That is why most people who buys a new property from a developer will not have to worry about any down-payment.

And from banks' perspective, they worry that developer can give you ridiculous discounts but bank still have to finance 90% of the full price instead of discounted price. So this can be a business risk for them because some people may struggle to pay higher monthly installment than they need to. But this is my theory la. I dont know la whether banks ever worry about stuffs like this. lol