Kourtney Kardashian has jetted off on a romantic trip with boyfriend Travis Barker.The sweet pair, who recently sparked marriage rumours, have journeyed to Cabo San Lucas, and it's been a monumental moment for Blink-182 star Travis, who has taken his first flight in 13 years.The rocker was in a fatal plane crash in 2008 which killed two of his closest friends. Kourtney has reportedly been helping Travis to overcome his PTSD from flying after the deadly crash.