84年F15在25千米以60度仰角发射反卫星导弹， 飞到三万米高空应该没问题

84年F15超音速在25千米以60度仰角发射反卫星导弹。 如果当时是F15的极限速度（994米/秒），在忽略空气阻力的前提下可以再滑翔升高18903米。 保守一点，冲到气球高度毫无问题。

https://theaviationgeekclub.com/f-15-satellite-killer-asm-135a-asat-missile/

Then following NORAD’s command, the F-15 would have headed towards the target in a supersonic zoom climb to launch the missile: as described by Steve Davies and Doug Dildy in their book F-15 Eagle Engaged, the ASAT had to be launched from extremely high altitude (80,000ft) and high angle (60-65 degrees).