"whisky-dave" wrote in message
...
On Monday, 18 December 2017 16:58:36 UTC, Rod Speed wrote:
whisky-dave wrote
Rod Speed wrote
whisky-dave wrote
Vir Campestris wrote
whisky-dave wrote

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.

True, but thats for other reasons.

Yes because they donl;t like losing radar contact with planes,

Thats a lie with the long haul flights
over the ocean. There is no alternative.

they are in the minority presently.

Irrelevant. And when the system handles those fine,
no point in having full radar coverage over the long
haul routes over land when its nowhere near any
major airports.

Didnlt find Malaysia Airlines Flight 370 did it.

Because they chose to turn theirs off to save on the cost.

So how comes they couldn't use radar to find where the plane was ?

Because its not possible to have full radar coverage over oceans
as big as that. And planes arent forced to fly where there is full radar
coverage either, most obviously between the RSA and Australia. The
alternative works fine and has done for well over half a century now.
In spades with the Pacific and southern Atlantic.

Friend flew from gatwick to cacun on tuesday explan
why they didn't just fly directly across the ocean

Because the system is moving to the new system which
allows all ACARS equipped aircraft to be tracked anywhere.

Sure a systemn from 1978, being replaced by GPS.

ACARS isnt being replaced by GPS.

It will be replaced as ACARS isn;t in real time

Thats is a bare faced pig ignorant lie.

and can be turned off.

So can transponders.

It is going to be replaced where they use the 'internet' rather than
radio.

Even sillier and more pig ignorant than you usually manage, and thats
saying something.