The clearance was described Statement by witnesses as being brutal and sudden .

then , without soviet air clearance , churchill sent Sending over 200 low-level supply Supply drops by the royal air force , the south african air force , and the polish air force under british high command Control , in an operation known as the warsaw airlift .

later , after gaining Getting soviet air clearance , the u.s. army air force sent Sending one high-level mass airdrop as part of operation `` frantic '' .

Because of the heavy commercial air traffic into Newark , LaGuardia , and Kennedy airports , an air traffic control Control clearance is required Preventing_or_letting to operate Being_in_operation in much of the airspace around the city .

since atc is often unwilling to grant Commitment this discretionary vfr clearance because of traffic volume , many airplanes that need to transit Having_or_lacking_access the new york metro area use the vfr corridor as an alternative to going Self_motion east of the city ( over water ) or west ( toward pennsylvania ) .

While on approach on runway 33 in Warsaw at 7:30 pm the crew received Receiving landing clearance .

He had requested Request line clear for the express train from the preceding signal box before receiving the required clearance from the following signal box .

The subsequent investigation Criminal_investigation by Spanish authorities concluded Coming_to_believe that the primary cause Causation of the accident was the KLM captain 's decision to take off Departing in the mistaken belief that a takeoff Self_motion clearance from air traffic control Control ( ATC ) had been issued Creating .

Pakistani military initiated Process_start countermeasures to improve Cause_to_make_progress security by increasing Cause_change_of_position_on_a_scale the door-to-door clearance and the applied counterinsurgency tactics by the Army Special Forces and the Navy SEAL Teams , but this failed to curb the Mukti Bahini activity .