McDonnell Douglas nomenclature referred to aircraft families within a type as “Series”. For example, “Series 10”. Within the series were specific versions.
| DC-9-11 | Series 10, Initial production | JT8D-1 then also JT8D-1A/-1B/-5/-7/-7A/-7B/-9/-11/-17, MGTOW 77,700lb (later to 85,700lb); all converted to -14. |
| DC-9-12 | Series 10 | JT8D-5, later -1/-7, MGTOW 79,500lb, later 85,700lb; all converted to -14 |
| DC-9-13 | Series 10 | JT8D-5, later -1/-7, MGTOW 85,700lb; none built |
| DC-9-14 | Series 10 | JT8D-5, later -1/-7, MGTOW 87,500lb, later 90,700lb |
| DC-9-14 (F) | Series 10. Conversion. | Freighter conversion of -14 with Side Cargo Door |
| DC-9-15 | Series 10 | JT8D-1, later -7, MGTOW 90,700 |
| DC-9-15 (F) | Series 10, Conversion | Feeighter conversion of -15 with Side Cargo Door |
| DC-9-15F | Series 10 | Freighter with SCD; JT8D-7, MGTOW 90,700lb |
| DC-9-15F (MC) | Series 10 | Minimum Change (DAC: -15MC), -15F with folding seats |
| DC-9-15F (RC) | Series 10 | Rapid Change (DAC: -15RC), -15F with seats on pallets |
| DC-9-21 | Series 20 | Special version for SAS with Series 10 fuselage and Series 30 wings. |
| DC-9-31 | Series 30 | Stretched and rewinged. originally JT8D-9-powered and MTOW 121,000lb; later JT8D-15 or -17. |
| DC-9-32 | Series 30 | Originally JT8D-7-powered and MTOW 108,000lb; later JT8D-9, -15 (15,500lb) or -17 and MTOW 110,000lb. |
| DC-9-32CF | Series 30 | Same MGTOW as -32 and powered by either JT8D-9 or -11. |
| DC-9-32AF | Series 30 | Probably same specs as -32CF. |
| DC-9-33 | Series 30 | Originally JT8D-9-powered with MTOW 114,000lb; later JT8D-11 (15,000lb). |
| DC-9-34 | Series 30 | Originally JT8D-9-powered withMTOW 121,000lb; later JT8D-15 or -17. |
| DC-9-41 | Series 40 | Further stretch. |
| DC-9-51 | Series 50 | Final stretch of the “original” DC-9 |
| DC-9-81 (MD-81) | Series 80, Initial production | Relaunched and revamped DC-9. Stretched. JT8D-217C |
| DC-9-82 (MD-82) | Series 80 | Development of the -81 with higher MTOW and longer range. JT8D-217C or JT8D-219 |
| DC-9-83 (MD-83) | Series 80 | Final development of the Series 80 with further increased MTOW and longer range. JT8D-219 |
| DC-9-87 (MD-87) | Series 80 | Shrink of the Series 80. JT8D-217C |
| MD-88 | Custom build for Delta with the Series 80 fuselage and wings coupled with the MD-90 avionics. | |
| MD-90-30 | The last McD airliner. A further development of the DC-9. | |
| Boeing 717 | Originated in the MD-95 program but completely revamped after the Boeing acquisition of McD. |
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