The irony of "air disasters" is twofold.
First, the deadliest airline disaster in history took place on the ground, not in the air.
It was at Tenerife when KLM Royal Dutch 747 slammed into TWA 747 taxiing off the runway.
Second, the KLM captain was the senior pilot in this very fine airline and he didn't have takeoff clearance. He was in a hurry to keep under the maximum number of hours on duty.
Both air traffic controller and copilot were keying their microphones simultaneously with copilot saying we're going and ATC concluding his announcement "Okay". One of them should have confirmed something, "We're rolling" or "Did you get my last transmission"? Seconds from no accident. Seconds. Over 500 killed.