See

http://www.tc.faa.gov/its/worldpac/techrpt/ar97-26.pdf

This includes both Mcdonnell and Boeing HSCT-s (HSCT standing for High Speed Civil Transport) , as well as a number of subsonics - including A3XX-100 and A3XX-200.

But oddly (since Airbus is included), no AST (Airbus Supersonic Transport) or Alliance.

A couple of observations:

Both Boeing and Mcdonnell planned to carry 300 passengers. Boeing thought 290 tons is enough for MTOW - Mcdonnell thought they needed 340 tons. Where does the difference come from? Range?

Both are over 90 m long, MD HSCT actually over 100 m.

Boeing HSCT is described as having fuselage width of about 455 cm. Weird. Somewhat wide for single aisle 6 abreast (A320 is 395 cm, B737 376 cm), yet narrow for twin aisle 7 abreast (B767 is 503 cm).

Both Boeing and Mcdonnell HSCT-s seem to stand nose down on gear - strikingly so for Boeing. Why?

Which plane would you rather fly - a Boeing HSCT or a Mcdonnell HSCT?

As for subsonic NLA-s (NLA standing for New Large Aircraft), what is your favourite? MD-XX? Boeing 747-500/600 series?

Note that the 747-500/600 wing is much bigger that 747-800 wing, and almost as big in span as A380-800 wing. As for engine locations, the 747-500/600 engines are further outboard than on -400 and even A380-800.

Note that B747-600 at 84,7 m length is longer than Mriya.

Would you prefer to fly a 747-500 or an A380-800?