Supersonic jet aircraft

A supersonic jet aircraft comprising:

• at least three turbofan engines that each have identical turbofan engine cores, the at least three turbofan engines being configured to provide thrust to the supersonic jet aircraft to perform subsonic flight operations and two of the at least three turbofan engines being configured to provide supersonic flight operations, the at least three turbofan engines including:
• a first engine configured to be de-activatable during flight to move from a first operational state in which the first engine provides thrust to a second operational state in which the first engine stops providing thrust, the first engine having a non-supersonic inlet, and
• the other engines of the at least three turbofan engines configured to provide thrust to the supersonic jet aircraft when the first engine is de-activated such that the supersonic jet aircraft performs a supersonic climb operation or a supersonic cruise operation;
• and
• an engine management computer configured to:
• command thrust from the first engine during the subsonic flight operations of the supersonic jet aircraft;
• and
• automatically de-activate the first engine when the subsonic flight operations are complete.