Polish crash in Sochi? Are you referring to the recent weather and human factors (and not just cockpit crew) -related incident at Smolensk?

In any case, aircraft separation is pretty stringent, ATC is pretty rigorous - particularly in high-density areas like DFW - and it is hard to ignore a TCAS warning. We're well beyond the days when "IFR" meant "I Follow Roads".

The thread title has been changed to be more informative to members. And as this isn't really related to any specific airline, but rather to a more general discussion of commercial aircraft flight procedures - so the thread will be directed to land at a more appropriate forum. / Moderator