In my experience, airlines are cool if you have a visa. It's when you try to board without one they may ask for onward travel (within 30 days in that case.)
Similar to other responses. Enter by air: 30 day exempt. Then, extend at immigration OR do a border bounce. I would recommend the Vientiane-Nong Khai border. Very friendly. And you could pop by Udon Thani, which is rather nice. Feel free to PM for more info.
Sorry, it's a plain ticket to anywhere that you can show to prove onward travel withing the number of days you're initially allowed into the kingdom. Whether you use it or not is a different story. You might throw it in the trash and go get an extension of stay instead.
I really don't have the time or the inclination to go look up examples. On countless occasions I have asked something or sat on relevant helpful info. Only to see... Thread closed. I have no more to add to that. So, I'm shutting down further questions :)