What happens if you don't cancel a flight?

Related questions

1. Does main cabin extra get free drinks?
2. What can I do with a non refundable airline ticket?
3. How do I rebook my Austrian Airlines?
4. What do airline booking codes mean?
5. Does it cost money to extend a flight?
6. Can you rebook a flight you Cancelled?
7. Which terminal does Austrian Airlines fly from at Manchester?
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Tags

1. #charge
2. #flight
3. #cancellation
4. #rebook
5. #cancel
6. #change
7. #cases
8. #ahead
9. #refund