Originally Posted by
MCDU2
There are significant savings to be made avoiding radar control and utilising High Level Airspace (HLA) as well subject to winds and sig wx. Many flights will avail of the WATRS routes into the SE parts of the US (eg: MIA/MCO/TPA) from Ireland/UK/Near Europe.
Indeed, it’s always just down to best winds/shortest shortest distance - For example you sometimes see some interesting routings between the U.K. and South America which is due to trying to avoid high navigation services charges associated with some FIRs.