The scheme would work as follows. Firstly, a new terminal on the north side of Edinburgh Airport close to the Fife line should be built, with a station to serve it. Next, a curve should be built so that Glasgow-Edinburgh trains could diverge from the existing route east of Winchburgh to serve the new airport station. The removal of most flights (except local flights to the Western Isles) from Glasgow Airport should be next. With Edinburgh Airport within half an hour by train and rail served Prestwick also serving the west side of Glasgow I don’t see that a third airport is needed — and this would save the cost of providing a rail link to Glasgow Airport. Finally, a transit system under the runway should be built, which would link the new and existing terminals at Edinburgh. People could then arrive at either terminal and fly from the other, or use the transit system for through journeys by surface transport. The existing terminal is better located for people arriving by road or tram. The airport station would be used as a train interchange by passengers for journeys such as Glasgow to Fife.