New details show that the failures leading up to the midair collision of a regional jet and an Army helicopter were more ...

New details revealed by The Times show that the failures on Jan. 29 before an Army helicopter crashed into a jet near Reagan National Airport were far more complex than previously known.

If that all sounds a bit much from the off you might want to take a look at our handy hint for the January 29 (1320) puzzle, designed to give you a push without spoiling the fun. My opening word ...