Over 1960s to present time. The T-Tails airliner always accompanied quack air for almost 60 years. From McDonell Douglas DC-9, MD-80, MD-90 , and finally Boeing 717. The DC-9 is being iconic aircraft of Quack Air since 1967. Quack Air is the largest operator of DC-9 in Duck Republic. They operate DC-9-10, DC-9-30, DC-9-40, and finally DC-9-50. Let's focus on DC-9-50

About McDonell Douglas DC-9-50 of Quack Air

In 1970s, Quack Air need larger DC-9 for more passenger. So they make order on the new aircraft which named McDonell Douglas DC-9-50 in 1975. The first delivery took on 1977 with the first registration is N551QA (this airframe already withdrawn in use in 2015 finally stored and Broken up in Victorville on same year). 5 of DC-9-50 are bought from of airlines beside most of them are pure fleet. Between 1977 to 1980. Over 30 DC-9-50 being delivered to Quack Air.

On Spring 2015, all DC-9-50 is retired peacefully and replaced by Boeing 717-200 and McDonell Douglas MD-90 marking the end of DC-9 era of Quack Air. Most of Quack Air DC-9 are being scrapped at Victorville California. Except some 4 airframe with only 3 remaining (N570QA preserved in Duckburg Aviation School, N572QA preserved in San Fransisco international airport for crew training, N577QA being preserved in Quack Air Museum, N581QA formerly preserved at Jackson Aviation Museum in Duckburg but scrapped in 2020)