Speculation is damaging to probe of midair collision over Potomac River, writes CNY man who flew that route hundreds of times ...

NTSB investigates Blackhawk altitude discrepancy, missing communications in Potomac midair and transmissions that were not received.

The helicopter crew may have had bad information on the altitude from their altimeter, as the pilots had differing altitudes in the seconds before the crash, the NTSB said. Emergency response ...