Price Vs. Flexibility
A stopover is a stay of one night or more at some point in the itinerary. If a traveler is flying between New York, USA and Rome, Italy he might choose to spend a weekend in Paris en route to Rome. Paris then becomes a stopover.
Fully flexible fares are the most useful for business travelers but some discounted fares offer limited flexibility.
On some routes, the day of the week that the traveler flies can affect the fare.
Some discounted - cheaper - fares allow the traveler to change travel arrangements after the ticket had been purchased. These fares are preferable for business travelers with constantly changing schedules.
Under each of the above fares, we saw the conditions relating to the booking. The first five were all booked a number of days before the journey begins, e.g. "Booked 7 days".
There may be a wide choice of fares on offer for a traveler sitting in the Economy cabin. For a start, there will be a flexible Economy fare, plus a variety of cheaper options called "discounted excursion fares".