早期 そうき警戒 けいかい管制 かんせい じゃなかったです
sō kikeikaikanseikijanakattadesu

Noun
Desu Copula

The polite, past negative form of 早期警戒管制機

1. Wasn't an early warning control aircraft.; Wasn't an early warning and control plane.

Past/Perfective
Negative
Polite
Casual Register