Pak Air Crash

A Pakistani relative of Shabbir Ahmed, who lost his life in Friday's crash of a Bhoja Air Boeing 737 passenger plane, places his picture on his coffin, after displaying it to members of the media, outside a hospital in Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of the airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Muhammed Muheisen)

Pakistan army troops stand in the remains of Boeing 737 passenger plane scattered at a field at the site of plane crashed in the outskirts of Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Anjum Naveed)

Family members of a Pakistani man who lost his life in Friday's crash of a Bhoja Air Boeing 737 passenger plane are reflected as they gather around his coffin outside a hospital in Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of the airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Muhammed Muheisen)

The sister of a Pakistani man who lost his life in Friday's crash of a Bhoja Air Boeing 737 passenger plane cries over his coffin outside a hospital in Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of the airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Muhammed Muheisen)

Pakistan army troops search as local residents look from rooftop of their house at the site of Boeing 737 passenger plane crash on the outskirts of Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Anjum Naveed)

Pakistan rescue workers remove remains of a dead body from the site of Boeing 737 passenger plane crash on the outskirts of Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Anjum Naveed)

People carry a coffin containing a body of a victim from Friday's plane crash, in Karachi, Pakistan on Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo)

Family members of a plane crash victim mourn in Karachi, Pakistan, as they are about to leave for Islamabad, on Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo)

Pakistani volunteers carry a coffin of a passenger killed in a plane crash, at a local hospital in Islamabad, Pakistan on Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/B.K. Bangash)

Pakistan army investigators and media examine the wreckage at the site of Boeing 737 passenger plane crash on the outskirts of Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Anjum Naveed)

Pakistan army troops search at the site of Boeing 737 passenger plane crashed on the outskirts of Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Anjum Naveed)

Pakistan army troops and rescue workers search through the wreckage of the Boeing 737 passenger plane that crashed in the outskirts of Islamabad, Pakistan, Saturday, April 21, 2012. Pakistan blocked the head of an airline whose jet crashed near the capital from leaving the country as it began an investigation Saturday into the country's second major air disaster in less then two years. (AP Photo/Anjum Naveed)