Back in the '70's, QANTAS DID fly to Mexico City! it was called the 'Fiesta Route' to London. The routing was: SYD/NAN/PPT/ACA/MEX/NAS/BDA/LHR......what a marvellous way! You could have stopovers at these marvellous cities.  There was a 14/28 day Excursion fare. I spent a few days at ...