I realise for any Polish person posting here there is an emotional connection, but please, don't try and convince anyone that a Tu154 era aircraft (no matter how well maintained and operated) will achieve anywhere near the level of safety afforded by (for example) a borrowed LOT B737.
The B-737 design is a few years older than the Tu-154 one.
If the very dense fog/low cloud at Smolensk was the main cause of the crash, the question is, would another plane with newest avionics made the difference?
Arrakis