Can I enter Thailand on a 30-day visa exemption and extend my stay to 60 days with a return flight booked for 60 days later?

The user is inquiring about entering Thailand on a 30-day visa-exempt entry and whether it would be acceptable to book a return flight for 60 days later, along with extending their stay for an additional 30 days. Multiple comments indicate that it's essential to check with the airline regarding their policies on onward travel. Some suggest booking a cheap refundable flight to satisfy airline requirements, while others note that immigration officers will typically not question the return flight as long as the airline accepts it.