Aircraft having a redundant and efficient bleed system

An aircraft having at least one thrust providing jet engine and a fuselage with an integrated pressurized cabin, the aircraft comprising:

• an environmental control system comprising at least one pneumatic air cycle air conditioning unit;
• a bleed air port in the at least one thrust providing jet engine;
• a non thrust providing auxiliary supply unit adapted for providing electricity and compressed air on ground and during flight;
• and
• at least one compressed air line;
• wherein the at least one compressed air line is coupled with the bleed air port and the auxiliary supply unit;
• wherein the environmental control system is coupled with the at least one compressed air line;
• wherein the auxiliary supply unit is dimensioned to exclusively operate the environmental control system by delivering compressed air;
• wherein bleed air from the bleed air port is selectively providable to the environmental control system for redundancy;
• and
• wherein the auxiliary supply unit is coupled with a catalytic converter configured to receive a flow of hydrogen and compressed air, and to provide a continuous combustion of hydrogen with compressed air as oxidant and producing a flow of oxygen depleted air.