All the fares shown in the "More Differences in Scheduled Airfares" section (except Mrs. Sato's discounted fare) are valid for one year. The fares are valid for a full year from the date of the start of the journey. So if your journey is planned to commence on 15th August in 2001, the ticket is valid until 14th August 2002. (Your ticket was purchased on 2nd August).
You can change the date of the return, as well as the start of your journey. Providing you have the ticket, you can leave on the 10th or 12th August, but you'll have to check for the availability of a seat on an earlier flight.
Flexibility of Dates - there are no minimum or maximum stays.
The fares can be used for very short or very long stays. If a passenger wants to fly to a destination for a meeting and return the same day, he can do so. He can also stay for 11 months if necessary. (Remember, the fare is valid for one year).
Flexibility of Routes - fares can be used for complex journeys.
All the fares above can be used for journeys with more than one destination. If a business traveler wants to fly from Brussels to Zurich for a meeting, then on to Rome the following morning for a three-day conference, then two nights in Frankfurt, and finally head home to Brussels, he will be able to complete this itinerary as part of his Brussels to Rome return fare. For more details of how this is possible see Unit 9: Finding the Best Fare 2.
All this flexibility is available for the three types of fare: F, C and Y.
Occasionally other single letter codes may apply according to individual airline systems.