I mean, B2 Spirit bomber had first flight in 1989 it's barely younger than HIMARS rockets design used by Ukraine. B2 aging fleet gonna be replaced with B-21 Raider in nearby future so why keep pieces of somehow still flying metal scraps in USA while Ukraine gonna put them to good use last time in their history? /s

Ukraine Air Force spokesperson say combat aircraft is chosen and pilots/service crew will start training soon along with preparing airfields to handle Western aircraft soon.

But I take it with massive grain of salt.