ICAO		IATA		Other		Location
LTAX						Erdemir, TR (28 mi / 44 km NE)
LTBQ		KCO				Köseköy [Cengiz Topel NAS], Kocaeli, TR (51 mi / 83 km W)
LTAS		ONQ				Zonguldak (Çaycuma) [Zonguldak Airport], Zonguldak, TR (67 mi / 107 km NE)
LTBY		AOE				Eskisehir [Eskisehir Anadolu Airport], Eskisehir, TR (86 mi / 138 km S)
LTBI		ESK				Eskisehir, Eskisehir, TR (87 mi / 140 km S)
LTBP						Yalova, TR (88 mi / 141 km W)
LTFJ		SAW				Istanbul [Sabiha Gökçen Intl], Istanbul, TR (89 mi / 143 km W)
LTBR		YEI				Bursa [Yenisehir], Bursa, TR (91 mi / 147 km SW)
LTBX						Istanbul (Sarigazi) [Samandira], TR (93 mi / 150 km W)
LTAE						Ankara [Akinci], TR (104 mi / 167 km SE)
LTAV						Sivrihisar, TR (109 mi / 175 km S)
LTBA		ISL				Istanbul [Atatürk Intl (Yesilköy Intl)], Istanbul, TR (114 mi / 184 km W)
LTAD		ANK				Ankara [Etimesgut], TR (115 mi / 185 km SE)
LTBE		(BTZ)				Bursa, Bursa, TR (117 mi / 189 km SW)
LTAB						Ankara [Guvercinlik], TR (118 mi / 189 km SE)
LTFM		IST				Istanbul (Arnavutköy) [Istanbul Airport (Istanbul Havalimani)], Istanbul, TR (119 mi / 191 km W)
LTBN						Kutahya, TR (120 mi / 194 km SW)
LTAC		ESB				Ankara [Esenboga Intl], Ankara, TR (121 mi / 195 km SE)
LTHA						Ankara (Gölbasi) [Ufuk Danismend Polis Heliport], TR (128 mi / 205 km SE)
LTBW						Istanbul [Hezarfen Airport], TR (128 mi / 206 km W)

Perhaps you wanted a map of 41N-31E?