I've been reading on a forum I visit that people due to fly today have been contacted to advise their flight to Luxor has been cancelled.

Flights are still going to Luxor but - it's to pick up holidaymakers to fly them back to UK so the outbound flights are going out empty. Also, people at the Steinberger hotel who are due to be in Luxor till next Wednesday have been informed they will be leaving today as well.

As far as I'm aware and from what I've read - no flights to the Red Sea resorts are currently affected.

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Just come across this too for easyjet:
easyJet Operations Control

easyJet Operations Control
Following the advise of the Foreign & Commonwealth Office, we are recommending against flying to Luxor unless your journey is urgent. We are happy to offer your a free transfer to another flight if you choose not to travel. The flight however will operate as normal should you wish to continue with your journey plans. Please copy and paste the following link into your browsers address bar for more information:

https://www.gov.uk/government/news/change-to-uk-travel-advice-for-egypt

Link to easyjet announcement here: http://www.easyjet.com/en/flight-tracker/flight/2013-07-03/EZY8741