A handful of international airlines continued service to Cairo on Monday, rescheduling flights around the expanded curfew imposed by Egypt's authorities as thousands of travelers sought to an exit route from the escalating political crisis.

EgyptAir, the country's flag carrier, operated a reduced schedule from the capital, while fellow Star alliance member Deutsche Lufthansa AG (LHA.XE, DLAKY) was among host of overseas carriers that canceled services over the weekend, a freeze it planned to keep in place Tuesday before reinstating direct flights the following day.

Egypt's commercial air traffic control system has continued to operate normally, according to updates from Eurocontrol, which oversees the European Union's air space.

The extension of Cairo's curfew forced airlines such as British Airways PLC to change their schedules to ensure passengers were able to travel to and from Cairo International Airport. BA is a unit of International Consolidated Airlines Group SA (IAG.LN, IAG.MC, ICAGY).

BA has continued operating flights from London, with a stop in Athens to take on fresh crews and provide flexibility for any further changes to the curfew hours. A weekend flight by U.K.-based carrier British Midland International, a unit of Lufthansa, was forced to return to London as passengers would have been unable to leave Cairo's main airport because of the curfew. The airline restarted flights Monday.

Middle East carriers provided the bulk of continuing services, with Turkish Airlines (THYAO.IS), Royal Jordanian Airlines, Saudi Arabian Airlines and Emirates Airline all maintaining operations despite delays stretching from three to six hours or more.

Alitalia and Austrian Airlines were among the European carriers continuing to operate Monday, with the KLM arm of Air France-KLM (AF.FR, AFLYY) changing its schedule to comply with the curfew while its Paris-based unit suspended services.

Eurocontrol also reported air traffic control congestion around Cyprus, which exacerbated delays on services from continental Europe to Egypt and other parts of the Middle East.

Delta Air Lines Inc. (DAL), the only U.S. carrier providing non-stop service to Cairo, suspended service after its Saturday flight.

BA and a number of tour operators continued to operate normal services to and from the Red Sea resort of Sharm Al Shaikh.

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