This is not a valid line of reasoning. Why not use boats in the main and planes in an emergency? You get the same lead time for much less. It also seems not to

This is not a valid line of reasoning. Why not use boats in the main and planes in an emergency? You get the same lead time for much less. It also seems not to understand the continuous nature of supply/demand... the reasoning only works for one shipment in isolation. Maybe it's easier to use only planes and never boats or something... but it's certainly not cost effective Also, why is the watch sold out for over a month if this is true?