Design an airplane operating from regional airports based on the following requirements:

Payload: 80 passengers (business class) and their baggage which in total, 120 kg per each passenger and baggage.

Range of 7000 nm at a cruising speed of about 0.85 mach.

Initial sizing and layout, mass estimation, engine size and selection, wing geometry, fuselage geometry, initial arrangement drawings, aerodynamic estimations, etc.