Which two airlines flew the supersonic Concorde until it was retired in 2003?

A gigawatt equals 1,000 of which unit? One hectare, the metric unit of area, equals about 2.471 of which unit? According to 1 Kings, which Israelite king "spake three thousand proverbs"? Which Ghanaian diplomat served as UN Secretary-General from 1997 to 2006? Which bird does Papa promise to buy in the lullaby "Hush, Little Baby"? Which two animals support the shield on Australia's coat of arms? Jesus nicknamed which pair of brothers "Boanerges," or "Sons of Thunder"? Which two national capitals lie on the Río de la Plata estuary?