On Fri, 15 Dec 2017 07:31:21 -0800, whisky-dave wrote:

On Friday, 15 December 2017 14:22:42 UTC, The Natural Philosopher
wrote:
On 15/12/17 12:06, whisky-dave wrote:
On Friday, 15 December 2017 11:12:11 UTC, The Natural Philosopher
wrote:
On 15/12/17 10:24, whisky-dave wrote:
On Thursday, 14 December 2017 20:57:12 UTC, Vir Campestris wrote:
On 07/12/2017 10:53, whisky-dave wrote:
This will or so they think will enable them to fly more planes as
theere can be more routes.

The bottle neck is the runways at the airport. That's why Heathrow
wants to build a new one.

Not all planes fly to heathrow.


Allowing free choice of routes is for fuel savings.

No it isn't.


The economical cruise altitude rises as the plane gets lighter, so
they want to climb gently all the way across the ocean.

But they don't do that.
They don't take the shortest route from A-B they take a route
where they can be tracked.
Friend flew from gatwick to cacun on tuesday explan why they didn't
just fly directly across the ocean


Great circle

Largely it takes you over greenland labrador and down the E coast of
the USA

Why doesn't it just go across directly then that would be a shorter
distance less fuel quicker flight ?

That is the shortest distance. That is going across directly.




It could go across cornwall but it doesn't it heads North to
greenland.


Buy yourself a globe and a bit of string and measure it

look at the real info that I have linked to.
The majority of air traffic contols stations DO NOT use GPS.
Not knowing where a plane is and at what height isn't the best way to
'control air traffic'
In the future when the majority of ATC can use GPS then things will
change and yuo do know that with GPS the ATC building doesn't even have
to be located at the airport it can be almost anywhere.

Having been caught out, you are ignoring the correction.

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