Duncan that's not correct, sorry. In fact you can check it in almost all the companies, all they have to do is open the company website, click on "Manage booking" and put the booking reference and passenger name. That's enough to check if it's a legit ticket - and if it's already paid.
So please, don't spread the "they cannot check", because with your name and booking reference/e-ticket number they DO can.
I myself have been checked a couple of times with onward tickets from Vietjet and Air Asia, and I can assure you they did be able to check the details.
I'm a bit worried because some people telling they're a bit more stricts in BKK/DMK... In September I'll enter by CNX, but on October, after my 2 weeks in Vietnam, I'll enter by DMK.
Thank you, that's new to me, good to know. Anyway I sign a contract in my condo... but maybe it's better the one you point because the contract in my condo is like 15 pages :D
Regarding if I could have a reject of entry, what do you think?
In some places you can apply for the extension 30 days before the expire date; I think 15 days in advance is to play safe in almost all inmigration offices.
The same with me: I'm slowly traveling through SEA (it's my 3er visit, previous were on 2013 and 2014) and like to stay for some time in Thailand because it's the country I like the most :)
I'm not doing visa runs/bounces, in fact I'm visiting all SEA (Laos, Cambodia, Thailand and now Vietnam) but staying in Thailand between countries.
In addition, my onward travel was bought back in December - I bought a return trip because it's cheaper and because I need to return to home in summer :D
Rick, I've read all the e-ticket for 5 or 6 times, and there's no one line saying I must show the card. The same said the operator who atended me by phone.
I hope it's just the onward what they want to see.