4

Prologue: the quote in the question is from Wikipedia, and the parts there that mention the designation to commercial aircraft emergencies have later been marked as "citation needed". Therefore, for as long as an authoritative source can not be verified, it might well be that in reality there is no such designation. Actually, should the nature of the ...


2

The other two 31's (not 31C) are "emergency use only" for large jets. They won't be used for anything but an emergency. While 4R is the usual runway used in that direction, 4L could be used in other-than-emergency cases. That's why it lacks the notation mentioned. How does that matter? Let's say 31C is closed for repairs. Absent a compelling emergency, big ...


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