Why exactly was the NES version of Black Tiger never released? Did Nintendo of America not like this Capcom game at all because of certain content? Would the addition of this game exceed Nintendo's third-party release guidelines (5 per year)? Was the release cancelled also because of the 1988 DRAM and ROM chip shortage that witnessed only a limited release of Zelda II: The Adventure of Link in its first few years?
Should it ever have been released, it would've been part of Capcom's 1989 NES cartridge release schedule given the five titles listed below that made up the 1988 release schedule.
Capcom games released for the NES in 1988 were:
1943: The Battle of Midway
Legendary Wings
Mickey Mousecapade (released in Japan in 1987 by Hudson Soft as Mickey Mouse)
Bionic Commando
Gun.Smoke
(that is exactly the five that Nintendo would allow Capcom to release)
~Ben