https://en.m.wikipedia.org/wiki/Lunar_Laser_Ranging_experime...
It is also not feasible to keep using million dollar missiles to shoot down thousand dollar balloons.
I kind of doubt that the planes are cheaper than ground based lasers. Even so, a mobile ground station could avoid giving away the US position and allow them to cover more area. Not sure how feasible that is.
E:over post limit but Streak Eagle was high performances preproduction airframe specifially designed to hit 100k for a few minutes. Hard to say if current blocks can do the same or reliable prosecute mission at 100k, finding out is value itself.
And then the Chinese, knowing the US would use it to undersell capabilities…
The F-22 and other "stealth" jets can carry radar reflectors to intentionally make themselves EXTREMELY visible on radar.
https://aviation.stackexchange.com/questions/82798/how-does-...
Why would they carry such a thing? For one, it helps reduce the risk of accidents during training and other situations where they are flying in friendly skies. Two, helps prevent nosy enemies from learning about the true radar cross section of these planes.
It's hard to find concrete information on the USAF's practices here, for the obvious reasons.
The following is speculation, but: one imagines that the F-22/F-35/etc carry these as standard practice when not flying combat missions/patrols. One also imagines that they can be jettisoned midflight (like drop fuel tanks) in case e.g. a patrol turns into a spicy situation. That's a guess, I don't know if that's true.
The rationale being that you may be able to hear a cat's claws on floorboards in the middle of the dead night, but you'd never hear it in the middle of a rave party. So pairing F-22s with eg F-15s becomes a valid strategy.
Obviously simplifying, but that's the essence of what ECM is.
But also, don't assume that the US was naive here. The USAF is pretty good at electronic warfare. It's very possible they were jamming the object's sensors in various ways.
I surmise you need large balloon to carry required instruments on one platform. Going forward IMO PRC just going to fly them higher, US can keep shooting them down... possible until they can't, both will reveal US capabilities. At minimum, finding out f22 + missile ceiling is worth the cost. PRC isn't going to stop program just because US domestic politics goes full retard, if anything, that's strategically exploitable especially if PRC can make current WH admin look weak by flying a balloon at height that can't be shot down. Medium/long term, PRC building/exposing CONUS vunerability is net benefitial for PRC posture - it's their version of, in DoD parlance, integrated deterence. IMO S analysis missing strategic calculus on PRC side.