The Seaboard Air Line was indeed a major US railway, and had nothing to do with airlines. They just happened to have the longest stretch of dead-straight railway track in the US, 79 miles, in North Carolina, and before aviation the expression "air line" meant the shortest, straightest distance between two points. Seaboard was, and to some extent still is, a common US expression for the East Coast.
Seaboard was, and to some extent still is, a common US expression for the East Coast.
Actually its an expression for ANY coast. In the US they talk about the Eastern Seaboard (the Atlantic coast) or the Western Seaboard (the Pacific coast).
You should not forget Transglobe/Tradewinds & Trans Meridian folks. Also Loftleider with the 44J & RCAF with the Yukons, all seen in the the UK. Had many happy hours on the Loftee J to JFK via KEF & return, legless all the way, as was the 'Fish Heads' way back then
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