A heads up for anybody thinking of entering Thailand without an onward ticket. I’ve had a extension of stay Non ‘O’ based on wife and daughter for several years and no issues.
Just tried to check in for a flight with Oman air and denied bcoz I did not have an onward ticket. I showed the check in staff my valid extension stamp till 2020 and they still refused.
Finally a manger saw sense and agreed that I did not have to purchase an outbound ticket.
But it did take a lot of explaining.