Can I extend my 30-day visa on arrival in Thailand and when should I book my flight out?

The user is confused about the process of extending a 30-day visa on arrival in Thailand. They previously extended their visa without issues but are unsure if this is still possible. They also inquire about the necessity of booking a flight out of Thailand within the initial 30 days or if it can be done during the extension period. Responses indicate that extending the visa for an additional 30 days is generally possible at an immigration office for a fee, although issues might arise with airlines regarding proof of onward travel if it doesn't align with the initial 30-day period.