What is SUBLO (Subject to Load) in Aviation ?

Aircraft may encounter different conditions on each flight. And because of these various conditions, airplanes have to fly on some flights without selling all their seats. These seats are subject to load –  SUBLO.

In other words, the seat blocks made when the planes cannot fly at full capacity due to the constraints they encounter due to various reasons are called subject to load – SUBLO.

SUBLO - Subject to Load
SUBLO – Subject to Load

Aircraft may face these constraints for many reasons. The altitude of the destination airport may be a reason for this. Besides, many meteorological conditions can cause “SUBLO” application. Or, balance calculations and adjustments, which are an important issue of load and operation, can also cause a constraint on the load and passenger balance of an aircraft.

The seats marked in red in the figure below are set as sublo and closed for sale. Sometimes the amount and distribution of cargo loads may also require “SUBLO” (subject to load).

Sublo-Subject to Load
SUBLO – Subject to Load

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