A lot of loved ones were lost on September 11, 2001 when Muslim jihadists hijacked and crashed four airliners.
Some of those victims quickly became aware of what was happening and did their best to leave last words for family and friends.
And those final messages are as haunting today as they were 16 years ago.
None more so than the transcribed phone message Brian Sweeney left for his wife, Julie, just moment before his death.
Sweeney was on United Airlines Flight 175 that crashed into the World Trade Center.