You can use the minibuses to go to Kizilay. You can get on the minibus from the bus stop in front of ODTÜ KKM. Cost is same.
You can use the BelkoAir busses to go to Airport. You can get on the bus from the bus stop where you get off the bus when coming from the Airport. The same bus stop is used for going to and coming from the Airport. Cost is same. The busses depart in every 20 min.