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A Guide for Passengers with Disabilities (JAL PRIORITY GUEST SUPPORT)

To Ensure a Comfortable, Enjoyable Journey

Please read the following before boarding the aircraft.

Cabin Environment

After take-off, an aircraft slowly gains altitude before reaching a height of 10,000m and a speed of 900 km/h, just below the speed of sound. Inside the aircraft, an environment similar to that on the ground is artificially created using air conditioners and air pressurization equipment. However, this environment is still significantly different from that on the ground.

Onboard Air Pressure and Function

Onboard air pressure when the aircraft is in level flight is 0.8, which is about the same environment as at 2,000m above sea level. The change in air pressure occurs onboard in the 15 to 30 minutes of ascent after takeoff and descent before landing.

Any trapped gas in the body will expand leading to pain and perforation of the eardrums and intestinal tact.


The longer the flight, the more humidity drops. Humidity falls to 20% or less on long flights. Cabin air is relatively dry which can lead to a sensation of dryness in the mouth, nose and eyes, though studies have shown that it does not lead to whole body dehydration.

Cabin Air Quality

JAll our flights are non-smoking. Fresh air is added to recycled air through a very fine filter for removing dust and ash.


Vibration occurs during takeoff and landing and when passing through air turbulence.

Sitting for Long Periods

On long-distance international flights, passengers remain seated for long periods of time.

Potential Traveler's Thrombosis (DVT) During a Flight
(Travelers' Thrombosis, or so-called "Economy Class Syndrome")

Sitting for long periods of time without moving your legs can cause the condition of Traveler's thrombosis (DVT), which results in blood clots in the inner legs.

The danger posed by these blot clots is that once the individual starts moving, a clot can travel in the bloodstream and end up blocking blood vessels to the lungs (lung embolus). Since Traveler's thrombosis (DVT) was first reported in economy class passengers it was nicknamed, "economy class syndrome."

However, the condition is not restricted to economy class passengers, and the same danger is present whenever people sit in the same position for a long period of time in any mode of transportation. The term "Traveler's thrombosis" is much more accurate. Those with the following illnesses or symptoms are at risk for Traveler's thrombosis (DVT):

  • * Passengers with varicose veins in the legs, or who have had an operation on, injury to, or malignant tumor in their legs, past Traveler's thrombosis (DVT), obesity with a propensity for blood clotting, as well as women using oral contraceptives, and those who are pregnant or have just given birth.

These individuals should all consult their physician before flying.


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