грамматика

[upahill]

самолет держал курс на Иркутск, где должен был взять на борт представителей оперативных органов внутренних войск МВД России для проведения ротации в Кавказском регионе.*

должен был, но не долетел. Какое время употребить?
Взять на борт? take on aboard?

the plane was bound for Irkutsk, where it would have taken RF Internal Affairs security troops aboard for carrying out force rotation in Caucasus.

Спасибо!

[Alex Nord]

where it was to...

[upahill]

Спасибо!

[d.]

если должен был по плану, и план не выполнен, то не просто was to, но was to + Perf. Infinitive

was to have taken
they were to have boarded

[%&$]

d.+1
The aircraft was heading for Irkutsk where it was to have picked up some operational command officers of Russia's Interior Troops to carry out force rotation in Caucasus.