1.   This is so the headlights can help guide rescuers to the damaged vehicle, and the dome light can help the occupants find their way out in the dark.

2.   He said helicopters would attempt to drop smoke bombs on Wednesday to guide rescuers to the site.

3.   Helicopter pilots had planned to drop smoke bombs Wednesday to guide rescuers to the site.

4.   The lack of a beacon on board to guide rescuers to any crash has only made the task more difficult and cost precious days.