The McDonnell Douglas MD-80 was a successful 20th-century family of narrowbody twinjets, with almost 1,200 units produced from 1979 to 1999. Affectionately known by many as the ‘Mad Dog,’ these aircraft were notable for their five-abreast seating configuration and rear-mounted engines, which set them apart from many of their contemporary narrowbody twinjets. But which airlines still fly them today?