Cabin pressurisation:

During flight, aircraft cabin pressure is maintained to a sufficient density for your comfort and health. As the aircraft climbs, the cabin may reach the same air pressure as at an elevation of 2440 metres above sea level. Cabin pressure does not pose a problem for most passengers. However, if you suffer from obstructive pulmonary diseases, anaemias or certain cardiovascular conditions, you could experience discomfort at these altitudes. These passengers should seek medical advice before flying as some may require supplementary oxygen. Qantas can arrange this but requires at least seven days’ notice before travelling.

The rate of change in cabin pressure during climb and descent is also carefully maintained and does not usually cause discomfort. However, children and infants, and adults who have sinus or nasal congestion, may experience some discomfort because of pressure changes during climb and particularly descent. Those suffering from nasal or sinus congestion due to a cold or allergies may need to delay travel. The following advice may assist: To “clear” your ears, try swallowing, yawning or pinching your nose closed and gently blowing against it. These actions help open the eustachian tubes, equalising pressure between the middle ear chamber and throat If flying with an infant, feed or give your baby a dummy during descent. Sucking and swallowing help equalise pressure in an infant’s ears. Give children something to drink or chew during the descent Consider using medication such as nasal sprays, decongestants and antihistamines 30 minutes prior to descent to help open up your ear and sinus passages