NEW : Delta cancelations only related to MD-88 , not MD-90s . NEW : its estimated 2,300 Delta flights were canceled Thursday for safety inspections . Delta Air Lines canceled 318 flights Wednesday to inspect MD-80 aircraft . American cancels 275 of its estimated 2,300 flights scheduled for Wednesday .
NEW : Delta cancelations only related to MD-88 , not MD-90s . NEW : 275 Delta flights were canceled Thursday for safety inspections . American Airlines canceled 318 flights Wednesday to inspect MD-80 aircraft . American cancels 132 of its estimated 2,300 flights scheduled for Thursday .