Mexico’s leftist president-elect has pledged to stick to his plan to get rid of the country’s presidential plane – despite finding himself stuck on the tarmac for three hours waiting for a commercial flight to take off.In video footage posted online from onboard the delayed flight from Huatulco to Mexico City, Andrés Manuel López Obrador said he would “die of shame” if he used “a luxurious plane in a country where there is so much poverty”.“I’m not going to . . .