Flying Fortress Sky Fire can only be summoned by the effect of "Summon Reactor-SK". The only problem is that KCVDS mis-named the card in the effect of Summon Reactor, wrongfully calling it "Sky Bomber-AIR RAID". I have the card in real life, and happen to know that it's supposed to say "Flying Fortress SKY FIRE". In fact, for proof...
Flying Fortress Sky Fire... 300px-SummonReactorSKCRMS-EN-C-1E
...on the 6th line.

Does that mean that, because the written effect on Kaiba Corps alone is wrong, it cannot be used?