This is by no means a comprehensive list of all of my ideas, nor does it fully describe them in the amount of detail I have thought of them in.
Z-1 Harpy
The Z-1 is an all-purpose plane with 16 jet engines, each with a different prime altitude, as well as two rocket engines for short bursts of speed, vertical landing and take off, and to re-enter the atmosphere from orbit. it has enough range in a full fuel tank to circle the earth, its maximum cargo load is more than a two-story house weighs, and it has enough firepower in its main cannon alone to level a small city with full ammo stocks. It has technically no maximum altitude because of its rocket engines. The only real restriction on its maximum altitude is the fact the plane has no on-board long-term life support. This means it will run out of breathable air, when flying outside of the atmosphere, before it runs out of fuel. It's cruising speed is supposedly faster than the maximum speed of the SR-71 Blackbird which was about Mach 3.
-F-80 Raven
The Raven is an interceptor type fighter jet built for high speed takedown of nuclear weaponry and other fighters. It has capacity for a singular 500 pound conventional or nuclear bomb. It will also be equipped with laser-targeting systems for torpedoes and/or missiles to takeout agile or small targets. I hope for its top speed to be somewhere around Mach 8-10 using electric motors and a turbo-SCRAM jet of my own design that uses liquid oxygen to fly at max speed no matter the altitude or air density. The Raven's main form of air-to-air combat will be simply dropping a load of ball bearings or flechettes from a small bay below the craft. As the plane itself will be flying faster than most bullets or missiles can fly, the best way to damage something is to simply run into it. With this in mind we can simply drop flechettes below the plane that would also be shooting through the air at just less than Mach 8, which would still be much faster and have much more energy than some of the most powerful cannons available. This is theoretically capable of shredding an entire plane into dust as if you just shot a duck with an anti-material rifle, all for the rice of a pack of shotgun shells.