Many fliers heading from Europe to South Asia were facing longer journeys as the India-Pakistan conflict meant significant route changes.
The sudden escalation in military activity meant that Pakistan airspace was being avoided by major airlines including British Airways with a watching brief on Indian routes in case the situation deteriorated even further.
The re-routing means long journey times for passengers as well as additional fuel costs for airlines already suffering from tight margins.
Airlines avoiding Pakistan airspace include BA, Lufthansa, Air France-KLM and Emirates with approaches from the Indian Ocean necessary for important Indian destinations including Delhi and Mumbai.
A host of smaller Indian airports near the Pakistan border have been closed to comical traffic because of the simmering tensions.
