Michael.

It'll be there immediately. If you already had 5 leased gates and built a 5 gate terminal, your flights from the leased gates will be transferred to your terminal. Therefore, your five-gate terminal will be full and to add more flights, you will need to construct more gates.

 the number of aircraft in service is higher than the total number of orders

Perhaps because starting aircraft are in service but don't count as orders? 

250 flights a week between JFK and ATL on just oneaAirline with more than 3500 seats a day and another one with 144 flights a week between those two airports in 1958. REALLY??? Somethings needs to be done against this spamlining, at least on a server that calls it's worlds realistic. This is pushing the fun in the game into the deep.

That isn't spamlining. That's recklessness and stupidity. Real spamlining is an art.

https://discordapp.c...762890544218112

How do people get 40 planes within 3 days of a new world starting.

By ordering multiple aircraft families. It's possible to hit 100 aircraft after a year if you lease multiple families and maintain a backlog (i.e. always have aircraft on order). Most aircraft that people use early in the game only have a two week or three week gap between each delivery. 

I see that you have ordered just one aircraft family in each of your current airlines - that's one aircraft every two weeks meaning the absolute maximum you can reach after a year is 24 (1 starting aircraft and 23 leased since you have to wait four weeks - not two - for the first delivery).