BagNavigator models seat-position under-seat clearance separately from published personal item limits to flag aisle-seat risk.
Guide #5
Applies to: All economy seat assignments and personal-item backpacks
Personal Item Reality: Underseat Storage Explained
Strategic Alert
AISLE SEATS TYPICALLY FEATURE 25% LESS UNDERSEAT WIDTH THAN MIDDLE SEATS DUE TO STRUCTURAL SEAT SUPPORTS AND LIFE VEST HOUSINGS.
Technical Summary
A "Personal Item" is defined as a bag fitting within an 18 x 14 x 8 inch footprint. However, a personal item can be dimensionally compliant and still fail under-seat placement due to seat hardware, not bag size. Airlines enforce personal items by under-seat clearance, not published maximum dimensions. Actual clearance varies significantly by seat assignment, with aisle seats offering the most restricted geometry.
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