If we want to be the regional power in Middle East we definitely need an aircraft carrier. Also if we want to be one of the most militarily powerful countries it is a must. Look at the countries with aircraft carriers:
Brazil (1)
France (1)
India (1)
Italy (2)
Russia (1)
Spain (2)
Thailand (1)
United Kingdom (1)
United States (11+9)
Aircraft carrier - Wikipedia, the free encyclopedia
Even Italy and Spain got 2 aircraft carriers. Heck Thailand got one!
Edit:
@ Manuz
I guess we can acquire one by buying it or making it ourselves, Turkey is in the end one of the best shipbuilder countries in the world. It is by the way Seymour Hersh who said that, i don't know where he gathered the intel. He says that Turkey is moving from a regional sphere to an international sphere and that the excessive developments within Turkish weapons industry demonstrates this.