Domestic flights with flexible dates or easy changes - which airline?

Cinnamon Air and FitsAir are the main ones. Policies vary with ticket type. More expensive flexible fares allow changes with smaller fees. Budget tickets are stricter. Always read the fine print on changes and cancellations. For domestic routes, rebooking is often possible but you may pay the difference in fare. It's generally easier to be flexible with ground transport than flights if your plans are uncertain. Check current policies directly with the airline as they can change.