As the nation continued to grapple with the unthinkable in the weeks following the Sept. 11, 2001, terror attacks, two American flags rose solemnly over gates at Boston Logan International Airport — one of Logan’s most enduring, yet inconspicuous, tributes to the passengers and crews lost that day.

The flags are posted at the exterior of B32 and C19, the gates from which the hijacked American Airlines Flight 11 and United Airlines Flight 175 departed 24 years ago Thursday.

Each airline hoisted a flag between a week to a month after 9/11, a spokesperson for the Massachusetts Port Authority confirmed in an email to Boston.com.

Speaking during the 2008 dedication of Logan’s official 9/11 memorial , then-Massport Chairman John Quelch shed further light on the flags’ origins.

“Both memo

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