[WoofDog123]

"Plenty of airliner accidents have happened and a mayday call was never sent. Sometimes the pilots are too busy with the problem to send the call.
"

If the planes were some distance apart, as some reports imply, what do you think might cause 2 planes to vanish, having left from the same airport at nearly the same time?

1. related accident/collision (distance is an issue here, how far apart where they when vanished from radar...if they were far apart they probably didn't collide.)
2. unrelated accidents (has this ever happened before)
3. hostile action
4. no planes have crashed

[WoofDog123]

"2. unrelated accidents (has this ever happened before) "

ok I am now reading that bad fuel can do this....it would certainly account for #2. Are there any other mechanical issues what could plausibly cause 2 planes to go down in order?

[COEXERJ145]

While terrorism is one possibility, other things cannot be discounted.

- Total coincidence

- Improper Fueling, Contamination

- Knowing how Russian aviation can be, just about anything could be the cause