Loganair has said it will make an additional 50,000 permanent low-cost fares available on its key routes between the mainland and the islands.
Stornoway is one of the destinations to get an extra flight
It also plans to introduce an extra weekday return flight on four routes.
They are Kirkwall-Aberdeen, Shetland-Aberdeen, Stornoway-Glasgow and Islay-Glasgow.
The announcement follows the Scottish Government's bid to extend cut-price fares for residents in the Highlands and Islands by another three years.
More than 200,000 tickets have been purchased since the government's Air Discount Scheme was introduced in 2006.
It provides a 40% discount on flights to islands and parts of the Highlands - which are often hit by higher fares.
The government wants permission from the European Commission to safeguard the scheme until March 2011.
It provides discounts to residents of Orkney, Shetland, the Western Isles, Islay, Jura, Caithness and north west Sutherland.
Loganair chief executive Peter Tierney said: "This is a very welcome announcement from the Scottish Government and gives us the confidence to launch the most competitively priced and widespread flight schedule ever offered in Loganair's history.
"With over 50,000 more seats available on our network this summer, this is great news for leisure customers, our tourism partners and the economy of the Highlands and Islands as a whole."