If you remember the classic The List Of Adrian Messenger, there was both a train wreck and a plane crash with a considerable loss of life to cover up a crime. In the case of this particular Kojak story there was only a plane crash that was discovered during this investigation to be bombing which is only part of the overall picture.
A skeleton is discovered during the razing of a building and identified as the remains of a missing person who ran out on his wife Gail Strickland when he was suspected of an embezzlement back in the Fifties. He was later identified as being on the passenger list of a Brazilian airliner that crashed.
I have to say that not only was this one well planned scheme, but it only was discovered after the skeleton was. Gail Strickland has lived quite well since her husband's demise, but someone else has been living quite a bit better as a result.
A certain key is the key to wrapping it up. You'll have to watch the episode to see what I mean.