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Before it became an international airport with six runways, Boston Logan International Airport was a muddy airfield primarily used by the Massachusetts Air Guard. Now, “New England’s largest transportation center’’ serves about 20 million passengers annually and boosts New England’s economy by $7 billion each year, according to Massport.

These photos show how, even though Logan has grown since it was known as Jeffrey Field in the early 1920s, some things, like long lines at the check-in counters and frustrated scowls when flights are delayed, haven’t changed over the decades.