Sue Thomas Season 6-3: Episode 8: Collide

When a flight tracking fan notices two planes about to crash into each other, she immediately calls 911 to warn them. Of course, her warning is too late and they collide, crashing not too far from Sue and Lucy. Worried that it's another terrorist attack, Jack and his team are immediately called on to work the case with the NTSB to find the cause. Slight crossover with Mayday