THREE Qantas flights have been forced to make unplanned landings in the last 24 hours.
Two planes made emergency landings at Perth Airport, in one case with dozens of passengers reportedly needing medical treatment.
Another Qantas flight, en route to Dallas, was turned back to Sydney after about four hours in the air because of technical issues affecting passenger comfort.
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Karratha-bound QF904 returned to Perth about 2.40pm after cabin crew noticed an unusual odour.
Earlier, a Qantas A380 passenger jet travelling from Dubai to Sydney was diverted to Perth when the air conditioning developed a fault as the plane was over the Indian Ocean.
As a precaution, the plane dropped to 10,0000 feet and the captain requested a priority landing.
In a statement late on Monday, Qantas said the technical fault on the QF7 flight to Dallas had impacted seat power, the in-flight entertainment system and some of the toilets.