The Latest: Cuba: 3 survivors 'critical' after plane crash

Grieving relatives of passengers who perished in Cuba's worst aviation disaster leave the morgue, in Havana, Cuba, Saturday, May 19, 2018. Investigators are trying to determine why an aging Boeing 737 carrying more than 100 people went down and erupted in flames shortly after takeoff in Havana. (AP Photo/Ramon Espinosa)
Relatives of passengers who perished in Cuba's worst aviation disaster grieve outside the morgue, in Havana, Cuba, Saturday, May 19, 2018. Investigators are trying to determine why an aging Boeing 737 carrying more than 100 people went down and erupted in flames shortly after takeoff in Havana. (AP Photo/Ramon Espinosa)
Grieving relatives of passengers who perished in Cuba's worst aviation disaster arrive to the morgue, in Havana, Cuba, Saturday, May 19, 2018. Investigators are trying to determine why an aging Boeing 737 carrying more than 100 people went down and erupted in flames shortly after takeoff in Havana. (AP Photo/Ramon Espinosa)
Forensic investigators and Ministry of Interior officers sift through the remains of a Boeing 737 that plummeted into a yuca field with more than 100 passengers on board, in Havana, Cuba, Friday, May 18, 2018. The Cuban airliner crashed just after takeoff from Havana's international airport. (AP Photo/Desmond Boylan)
Grieving relatives of passengers who perished in Cuba's worst aviation disaster arrive to the morgue, in Havana, Cuba, Saturday, May 19, 2018. Investigators are trying to determine why an aging Boeing 737 carrying more than 100 people went down and erupted in flames shortly after takeoff in Havana. (AP Photo/Ramon Espinosa)

The Latest: Cuba: 3 survivors 'critical' after plane crash

Grieving relatives of passengers who perished in Cuba's worst aviation disaster leave the morgue, in Havana, Cuba, Saturday, May 19, 2018. Investigators are trying to determine why an aging Boeing 737 carrying more than 100 people went down and erupted in flames shortly after takeoff in Havana. (AP Photo/Ramon Espinosa)
Relatives of passengers who perished in Cuba's worst aviation disaster grieve outside the morgue, in Havana, Cuba, Saturday, May 19, 2018. Investigators are trying to determine why an aging Boeing 737 carrying more than 100 people went down and erupted in flames shortly after takeoff in Havana. (AP Photo/Ramon Espinosa)
Grieving relatives of passengers who perished in Cuba's worst aviation disaster arrive to the morgue, in Havana, Cuba, Saturday, May 19, 2018. Investigators are trying to determine why an aging Boeing 737 carrying more than 100 people went down and erupted in flames shortly after takeoff in Havana. (AP Photo/Ramon Espinosa)
Forensic investigators and Ministry of Interior officers sift through the remains of a Boeing 737 that plummeted into a yuca field with more than 100 passengers on board, in Havana, Cuba, Friday, May 18, 2018. The Cuban airliner crashed just after takeoff from Havana's international airport. (AP Photo/Desmond Boylan)
Grieving relatives of passengers who perished in Cuba's worst aviation disaster arrive to the morgue, in Havana, Cuba, Saturday, May 19, 2018. Investigators are trying to determine why an aging Boeing 737 carrying more than 100 people went down and erupted in flames shortly after takeoff in Havana. (AP Photo/Ramon Espinosa)