▁Other ▁joint ly ▁operated ▁fl ights ▁soon ▁followed ▁with ▁Aust rian ▁Airlines , ▁Swiss air , ▁and ▁Cro atia ▁Airlines . ▁▁ 2 0 0 0 s ▁and ▁ 2 0 1 0 s ▁ ▁A ▁new ▁terminal ▁opened ▁in ▁January ▁ 2 0 0 0 ▁at ▁Ist an bul ' s ▁Ist an bul ▁At at ür k ▁Airport . ▁Turkish ▁Airlines ▁continued ▁to ▁extend ▁their ▁international ▁reach , ▁for ging ▁market ing ▁agre ements ▁with ▁As iana ▁Airlines , ▁American ▁Airlines , ▁Malays ia ▁Airlines , ▁L OT ▁Polish ▁Airlines , ▁Czech ▁Airlines ▁and ▁C ath ay ▁Pacific ▁in ▁ 2 0 0 0 . ▁On ▁October ▁ 2 9 , ▁ 2 0 0 0 , ▁TH Y ▁with d rew ▁from ▁the ▁Swiss air - led ▁Qual if ly er ▁al liance ▁to ▁help ▁attract ▁a ▁strateg ic ▁invest or ▁for ▁their ▁priv at ization . ▁The ▁air line ▁had ▁been ▁part ▁of ▁the ▁al liance ' s ▁frequent - fly er ▁program ▁since ▁November ▁ 1 9 9 8 . ▁An ▁Ant al ya - Fran k furt ▁route ▁was ▁added ▁in ▁ 2 0 0 1 ▁through ▁a ▁code - sh aring ▁agreement ▁with ▁Sun ▁Express . ▁ ▁Turkey ▁under w ent ▁an ▁economic ▁crisis ▁throughout ▁most ▁of ▁ 2 0 0 1 , ▁leading ▁to ▁a ▁reduction ▁in ▁traffic ▁on ▁domestic ▁routes ▁in ▁particular . ▁TH Y ▁managed ▁to ▁surv ive ▁after ▁the ▁September ▁ 1 1 ▁attacks ▁on ▁the ▁United ▁States ▁without ▁a ▁government ▁b