Blackbox

Etymology
.

Noun

 * 1)  black box; flight recorder

Usage notes

 * refers especially to the protective box, while refers especially to the recorders inside of it. Hence,, but . Nevertheless, both terms are also used interchangeably.
 * While the simplex has only the Germanised plural, the compound  also uses the English plural in -es.
 * While the simplex has only the Germanised plural, the compound  also uses the English plural in -es.