You say that United Airlines has the most modern fleet in the skies, well, sorry to disappoint you, but nearly all Western European and Asian carriers have a more modern fleet than UA. B727.200 isn't quite top notch, is it, B747.200 is also an ageing lady, isn't it...
For the on time record: Southwest is the US leader in on time departures, followed by Delta,US airways, American, Continental, TWA, Northwest, and then United!! (source: US DOT)
It is good to be proud of your company, but be realistic: United is a good airline, at least for US standards, but they can never tip the European ones...
Oh... The Mach subject: In the cockpit one does not normally work with mach, but in Knots (nautical miles), but off course you know that!