据美国有线新闻网报道，美国德尔塔航空公司官员称，该公司一架通勤飞机在从肯塔基州列克星顿蓝草机场起飞后不久坠毁，机上至少有50人，包括47名乘客和3个乘务人员。美国联邦航空局官员称飞机坠毁造成“大量伤亡”，但具体人数不详。

这架飞机的目的地是亚特兰大，飞机飞出机场约1英里后，在一片森林中坠毁。

美国联邦航空局官员称，坠毁的飞机是一架加拿大庞巴迪支线飞机CRJ-100。事故发生的原因正在调查中，目前没有任何迹象表明坠机事故是由恶劣天气造成。

　　飞机坠毁过程示意图

　　资料图片：CRJ-100机型

　　资料图：坠毁的飞机是一架加拿大庞巴迪支线飞机CRJ-100

　　新闻链接：庞巴迪公司CRJ-100型客机

　　失事的客机机型是庞巴迪公司的CRJ-100型双引擎支线客机。庞巴迪公司是加拿大一家以传统飞机制造国之中获得巨大成功的支线飞机制造公司。庞巴迪公司拥有加拿大飞机公司宇航集团、德·哈维兰飞机公司和肖特兄弟公司，此外，庞巴迪公司还生产公务飞机。CRJ系列是由庞巴迪宇航集团提供的民用支线喷气飞机，包括50座的CRJ-1OO/200、7O座的CRJ-700、90座的CRJ-900。庞巴迪也是目前唯一能提供40座到90座支线喷气飞机系列的公司。CRJ-100/200型:

　　属于50座级支线喷气飞机

　　CRJ100：原型机为挑战者CL601，在此基础上，机身加长6.10米，机翼部分作了较大改进。于1991年5月10日首飞，1992年获加拿大适航证书。1992年10月29日开始交付使用。1993年获欧、美适航证书。

　　同时还有研制生产加大航程的RJ100ER和航程更大的RJ100LR

CNN:Plane carrying 50 crashes; one known survivor

(CNN) -- A Delta commuter flight carrying 50 people crashed Sunday morning near Blue Grass Airport in Lexington, Kentucky, airport and airline officials said. One person is known to have survived.

That person is being treated at the University of Kentucky Hospital, according to the hospital spokeswoman.

"He is in critical condition," Gail Hairston said, without adding any other details.

There were 46 passengers, three crew members and one off-duty crew member on Delta Flight 5191 -- operated by Delta's commuter carrier, Comair, according to Michael Gobb, director of the Blue Grass Airport.

Gobb said it is still unclear how many people perished in the crash because "search operations are still going on."

Initial reports from first responders indicated all 50 people on board died in the crash, Federal Aviation Administration spokeswoman Laura Brown told CNN.

The commuter flight was en route from Blue Grass Airport to Atlanta's Hartsfield-Jackson International Airport, Federal Aviation Administration spokeswoman Laura Brown told CNN.

The plane crashed a mile from the airport shortly after take-off, the FAA said.

The aircraft was a Bombardier Canadian Regional Jet (CRJ)-100, which has a good track record, according to its history on the National Transportation Safety Board's Web site.

Flight 5191 was cleared for takeoff at 6:05 a.m. ET, which was the last communication between the pilot and air traffic controllers, FAA officials said.

The plane crashed at 6:19 a.m. ET, about a mile west of the airport, FAA officials said.

The plane was scheduled to land in Atlanta at 7:18 a.m. ET.

It is unclear what caused the crash. There were no reports of bad weather in the Lexington area.

"It was dark at the time of the accident, but it was clear," Brown said.

A team of National Transportation Safety Board investigators is heading to the crash site to begin an investigation.