From what I've read, one of the many reasons the Concorde was decommissioned was that the navigation systems would have been too expensive to modernize....

Also, the conditions had to be right to go supersonic. The Concorde could not do so just anywhere...
Is that the payware one or the freeware one...
My first flight in a 172 on August 20, 2004

Doing the right thing is more important than doing the thing right. (P. Drucker)
When all think alike, then no one i