TORONTO,& bsp;Aug. 4, 2020& bsp;/CNW/ –& bsp;Porter Airli es is updati g its retur -to-service date to& bsp;Oct. 7, from the previously-a ou ced target of& bsp;Aug. 31. Key factors affecti g the ability to restart service i clude the& bsp;Ca ada-U.S. border remai i g closed to o -esse tial travel u til at least& bsp;Aug. 21; the& bsp;Atla [...]