I intend to visit (visa exempt) for 45-55 days before leaving to Laos or Vietnam. Flying in from Aus. Given I'm not sure when I'll leave Thailand (definitely before the 60 days though) will I need an onward ticket of some sort? Potentially for both the Airline (Jetstar) or Thai immigration or both? Feel like I'll leave Thailand from Nong Kai by land rather than fly, although nothing is concrete atm. Help appreciated.