Here is a picture of a B2 bomber activating a cloak of ionised gas:
This gas cloak can glow brightly and make the craft look like a glowing ball. An orb.
The B2 is not limited to conventional propulsion, and it can hover.
The ionised gas cloak is no longer secret, but many aspects of the technology used in this aircraft are still classified as top secret.
Consider the possibility of different craft, some unmanned that use advanced technologies and are classified as secret.
Consider technologies such as the use of electromagnetics to create "electric lenses" to bend light around an object so that it cannot be seen.
The contents of the black ops arsenal cannot be quantified, it is after all secret.
But black ops were used on September 11, 2001.
And the evidence is mounting.
Many cloaked aerial vehicles were caught on video in operation around the World Trade centre on September 11, 2001.
Look just above the a and p of "gamma press" as the "plane hits the building.
It's a tiny, blinking spherical cloud-thing.
It goes through phases of being invisible.
There are also many in the blue sky to the right at the end of the shot.
Thousands of these have been filmed by people all over the world.