Will I have issues with a 90-day return ticket if applying for an extension on my Thailand visa?

The user is planning a 90-day stay in Thailand with a 60-day visa and a possible 30-day extension. They are concerned about having a return ticket for 90 days before securing the extension and whether this will cause issues with the embassy or airline. Responses suggest that onward travel proof within 60 days is typically needed for visa issuance and to avoid potential problems with airlines. Suggestions include purchasing a low-cost airfare to nearby countries or using onward ticket services for verification.