A jet with 134 people on board was sealed off at Glasgow Airport for more than an hour after passengers fell ill.
Public health officials were called to the airport and the BMI aircraft was isolated.
A doctor and an environmental health officer boarded the plane to examine four people from the same family who fell ill during the flight.
The shuttle plane from London Heathrow landed at 1830 GMT on Wednesday, but the passengers were not allowed to leave the aircraft until 1950.
A spokesman for BAA said isolating the aircraft was a "routine" procedure.
All other passengers on board have been advised to see their own doctors if any symptoms develop
BMI spokesman
A spokesman for BMI said a family of four began vomiting during the flight.
The UK residents were returning home from a trip to Karachi.
"As a matter of routine doctors were informed and went on board to see what the problem was," said the spokesman.
He said the family appeared to have contracted a stomach bug while in Pakistan.
"The doctor told them to see their GP in the morning and allowed them to go home," he said.
"All other passengers on board have been advised to see their own doctors if any symptoms develop."