Is putting fusion into an airplane feasible? 
Yes. A fusion-powered airplane can provide a variety of benefits. Efficient fuel consumption, less pollutants, cheaper fuel, and smaller engine are all benefits that a fusion engine can provide. 

Ideas about space shuttle redesign: 
The rubber o-ring failure

Introduction:
One summer night, I raised my 5-year old eyes towards the sky and sighed, "Ah, the moon". Although this fragment of a sentence may seem archaic and . Throughout my childhood, I've gawked at jets and helicopters during air shows and drew fantastical spaceships and fighter jets, twirling in endless loops and spirals. 
The first idea I had for my project was to fix something from the past; the space shuttle. The space shuttle program, although successful, was flawed in many ways. For instance, the space shuttle used solid rocket boosters to reach orbit. These, once lit, burned at maximum thrust until it ran out of fuel, and were about as safe as strapping a bomb to your chair and hoping it would launch you upwards. Also, the space shuttle did not have an escape plan in the event of an emergency, something even the Apollo mission had in the form of a booster built to launch the command pod away from the spacecraft. Finally, the space shuttle was known as the flying brick. Space shuttle commanders trained in a Grumman Gulfstream C-11 with the landing gear down, the engines in reverse, blinds on the sides and the flaps up. However, I had initially decided against this, as no one used 
Korolev

Powerplant: Compact fusion
Aerial and in space Stability
Center of mass, lift, and thrust
Additional systems
Cockpit
Landing gear
Landing gear covers
Gear bay
SAS SLS
RCS
Variable geometry wing
Power
Generator and engine
Troubleshooting
Change in velocity
TTW ratio
Instability
Entry aerodynamics
+ Angle of attack
Fulcrum
Spins out
Vertical Tail fin
Tons of drag
Use singular control surface
Engine blowout
Engine layout
Where does the engine sit? 
Thrust nozzles
Flipping out
Center of mass and center of lift
Can't reach orbit
Delta V
Air intakes?
Airbrakes
Ai - Two flaps thingy
landing where we want
trajectory
retrograde
Payload bay
One system
Mid-range
Cargo
People
Weight
Fuel
Radioactive shielding
Water-based RCS Monopropellant
Will water freeze
How do we limit the thrust, how do we not nuke the area

Purpose: 
The purpose of this project is to create a feasible model of a Single-Stage To Orbit spacecraft that can provide the necessary environment for a compact fusion engine, developed by Lockheed Martin. 

Procedure: Make the thing. Maybe 3-D print a model. 

Results: Should be a plausible model. Don't have to build the actual thing, obviously

Nuclear fusion is where deuterium and tritium is smashed together to create helium, an extra neutron, and a ton of energy. The benefits to nuclear fusion is that the input and output can be completely controlled, as the reactants and products are different. Compared to nuclear fission, a neutron is smashed into 235U and creates two broken pieces and a few more neutrons. These neutrons then create a chain reaction known as nuclear meltdown. 
Nuclear fusion also uses significantly less fuel to create and less shielding than nuclear fission. 
Nuclear fusion is a great alternative to many sources of energy. But I wondered whether or not it could be applicable to a airplane. An airplane equipped with nuclear fusion could stay in the air for days or months, restricted only by fatigue and supplies. 

Img: Lockheed Martin Skunkworks