As the COVID-19 crisis unfolds, airlines are speeding up the retirement of its older fleets. Delta Air Lines ( DL ) has bid a discreet farewell to its MD-88s and MD-90s, which served the airline for decades. The end of the type in the airline marks the end of an era that started in the 1960s, when DL became the launch customer of the Douglas DC-9, and whose legacy still lives on with the Boeing 717.
