According to the BBC:
http://www.bbc.com/news/uk-england-london-33196210
"The
8,000 miles (12,875km) journey from South Africa
to the UK usually takes about
11 hours."
That's more than Mach 1, based on what I remember
about the Concorde's Mach 2 speed (around 1350mph?)
Is this a new secret plane or something?