CAIRO - Lufthansa has resumed flights from Cairo, but British Airways says services will still be cancelled for another six days as a "precaution".
On Saturday BA alerted passengers who were about to board a plane from Heathrow to the Egyptian capital.
German airline Lufthansa also stopped flights between Cairo and Frankfurt and Munich but they resumed on Sunday.
BA took the decision to suspend flights on the Heathrow to Cairo route for "security reasons".
The British government said it was aware of BA "notifying passengers" of the decision to temporarily stop flights to Cairo.
The UK Foreign Office has updated its advice, saying "there is a heighted risk of terrorism against aviation".
A BA spokesman said on Saturday: "We constantly review our security arrangements at all our airports around the world, and have suspended flights to Cairo for seven days as a precaution to allow for further assessment.
"The safety and security of our customers and crew is always our priority, and we would never operate an aircraft unless it was safe to do so."
BA currently runs one flight from Heathrow to Cairo and back again per day - and says flights will continue to be suspended between the capital cities until next Saturday, 27 July.
Egyptair is continuing to fly twice daily between Heathrow and Cairo - and flights from UK airports to other parts of Egypt are still scheduled.
The Independent's travel editor Simon Calder told the BBC: "It seems to be specifically British Airways and specifically Cairo to Heathrow which is the concern."
A spokesman for Cairo airport told the BBC the airport had yet to be notified by BA of any such changes.
Christine Shelbourne, 70, from Surrey was due to go to Cairo for a week on Saturday with her 11-year-old grandson. She said she managed to check into the flight at 15:00 BST (14:00 GMT). However, her boarding card wouldn't open the barriers.(FA)