Air traffic controllers working midnight shifts may be overburdened.
LaGuardia's airspace is among the busiest in the country.
The NTSB is investigating the implications of extra roles on safety.
Strategic angle: Concerns raised by the National Transportation Safety Board regarding midnight shift controllers at LaGuardia.
Air traffic controllers working midnight shifts may be overburdened.
LaGuardia's airspace is among the busiest in the country.
The NTSB is investigating the implications of extra roles on safety.