[KC_Lion]

Ping!

[gaijin]

Methods for steathy approach & parasitically attach to and steal the take of enemy birds..?

I hope so.

[treetopsandroofs]

*BEEP* “Mission Control, re-entry system has failed. Switch to Plan B reporting:

US Military Space Plane Wings Past {$DAY = $DAY++} Days on Latest Mystery Mission

[Bobalu]

One of its tasks just had to be checking for neutron leakage from the two North Korean satellites.

In fact this sort of task is probably the main reason it was constructed.

EMP

[crazydad]

Searching for PLANET X, PANIC!

[Paal Gulli]

It obviously has an anti-satellite mission.

It's stealthy but not stealthy enough that the guys at Heavens Above can't keep track of it. At least until it decides to disappear.

https://www.heavens-above.com/orbit.aspx?satid=39025

https://www.heavens-above.com/PassSummary.aspx?satid=39025

And when it vanishes they get all giddy, like kids on an Easter egg hunt, vying for the bragging rights of being the first to locate it when it reappears.

[philman_36]

X-37B Orbital Test Vehicle
Based on NASA's X-37 design, the unmanned OTV is designed for vertical launch to low Earth orbit altitudes where it can perform long duration space technology experimentation and testing.

The mysterious X-37B: What's the Air Force's mini-shuttle all about? Sept. 6, 2017
The X-37B flies in low Earth orbit, up to about 250 miles high, and can stay there a long time.

Low Earth orbit does not make this a "space plane" or "space vehicle".