Flying in Turkey
Turkish Airlines had a domestic monopoly until 2005. Private liners have proliferated since, and fares are down by more than half.

Here's a list of Turkish domestic airlines for your convenience. You can buy your ticket online with each of them. Then you show up at the airport 40 minutes before flight time (make that 50 minutes in Istanbul), pick up your print ticket at the sales booth, and proceed to checkin. They are all reliable, courteous and almost always on time.

The third column shows the average number of daily Istanbul-Izmir flights.
Turkish Airlines (THY) www.thy.com.tr  15 
Onur Air www.onurair.com.tr 3
Atlas Jet www.atlasjet.com.tr 6
Sun Express www.sunexpress.com.tr -
Pegasus & Izair www.flypgs.com 4