Can I use a bus ticket instead of a flight ticket for a 90-day sticker visa to Thailand?

An Indian citizen seeking a 90-day sticker visa for Thailand is inquiring whether it's acceptable to present a bus ticket for exit instead of a flight ticket, as VFS requests a plane ticket. Responses suggest that while VFS specifies a flight ticket, in practice, some have successfully used bus or train tickets. Alternatives include purchasing an inexpensive onward flight ticket or using services that provide temporary flight reservations.