![Redefining the 757 replacement: Requirement for the 225/5000 Sector, Part 6. - Leeham News and Analysis Redefining the 757 replacement: Requirement for the 225/5000 Sector, Part 6. - Leeham News and Analysis](https://leehamnews.com/wp-content/uploads/2015/03/MOM-NSA-NLT-A322-cross-section2.png)
Redefining the 757 replacement: Requirement for the 225/5000 Sector, Part 6. - Leeham News and Analysis
![aircraft design - Could some one explain me with the mathematical relations on how the double bubble fuselage cross section (example A380) is designed. - Aviation Stack Exchange aircraft design - Could some one explain me with the mathematical relations on how the double bubble fuselage cross section (example A380) is designed. - Aviation Stack Exchange](https://i.stack.imgur.com/t6jxm.jpg)
aircraft design - Could some one explain me with the mathematical relations on how the double bubble fuselage cross section (example A380) is designed. - Aviation Stack Exchange
![Airbus Continues to Walk A Wide Line on Seating, and Boeing Takes The Fast Road to the Front – Flight Chic Airbus Continues to Walk A Wide Line on Seating, and Boeing Takes The Fast Road to the Front – Flight Chic](https://flightchic.com/wp-content/uploads/2014/07/boeing-cross_sections.jpg)
Airbus Continues to Walk A Wide Line on Seating, and Boeing Takes The Fast Road to the Front – Flight Chic
![Part 3: Boeing 757 replacement: 757 and Airbus A321neoLR versus clean sheet designs. - Leeham News and Analysis Part 3: Boeing 757 replacement: 757 and Airbus A321neoLR versus clean sheet designs. - Leeham News and Analysis](https://leehamnews.com/wp-content/uploads/2014/10/NSA-and-NLT-cross-sections.png)
Part 3: Boeing 757 replacement: 757 and Airbus A321neoLR versus clean sheet designs. - Leeham News and Analysis
![aircraft design - Why does the DC-9-80/MD-80 have this cusp in its fuselage? - Aviation Stack Exchange aircraft design - Why does the DC-9-80/MD-80 have this cusp in its fuselage? - Aviation Stack Exchange](https://i.stack.imgur.com/2GuZU.jpg)