National airline Egyptair announced on Monday the cancellation of all its domestic and international flights during curfew hours.
The company said it would cancel all flights scheduled between 3 pm and 8 pm (1300-1600 GMT) from Monday and that it would change certain flight times to abide by the curfew pending further notice.
It asked customers worldwide to contact the company to verify its new flight schedule.
The curfew was slapped on Cairo, Suez and Alexandria on Friday, theoretically narrowing the window of time available for protests.
But this did nothing to deter thousands of people from gathering for the seventh consecutive day in Tahrir (Liberation) Square, at the heart of Cairo, to demand the departure of President Hosni Mubarak.
The Egyptian uprising has killed at least 125 people and left thousands of injured since January 25.