The Outer Marker Crossed High That Left One Runway and Seconds to Spare
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The Outer Marker Crossed High That Left One Runway and Seconds to Spare
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The Outer Marker Crossed High That Left One Runway and Seconds to Spare
In this episode, we follow Delta Air Lines Flight 723’s final approach into Boston Logan on July 31, 1973, reconstructing the sequence of decisions, timing pressures, and shifting weather that led to the aircraft crossing the outer marker improperly. What choices and distractions stacked in those last minutes, and could the crew still correct course in time?
Date: July 31, 1973
Aircraft: DC‑9‑31 (N975NE)
Flight: Delta Air Lines Flight 723
Location: Boston Logan International Airport (approach over Boston Harbor)
Weather: Fog, ceiling 400 ft, visibility 0.5 mile, variable RVR
- The flight departed Burlington, Vermont, route included stops at Manchester, then inbound to Boston on a routine northeast corridor hop.
- Captain John N. Streil (49) had 14,840 total hours and 1,457 on the DC‑9; First Officer Sidney W. Burrill (31) had 6,994 hours with 217 on type.
- Clearance for the approach was delayed by just over one minute while ATC handled a traffic conflict, leaving the crew waiting during a critical phase.
- The aircraft crossed the outer marker already above the glideslope and faster than stabilized approach criteria required, with changing runway visual range between 1,400 and 6,000 feet.
- At decision height the crew failed to make the required visual/no‑visual choice as multiple small errors and distractions accumulated.
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