When does the person who comes by way of air or sea assume Ihram?
Question :
When does the person who comes for Hajj or 'Umrah by air assume Ihram?
Answer:
The person who arrives by air or sea assumes Ihram when he reaches a point (in flight) that is parallel to the place of the Miqat, just like the person who is on land. When he reaches the point that is equal (in distance) to the Miqat, he assumes Ihram in the air or on the sea or slightly before that so that he can be safe, due to the speed of the plane and the speed of the ship or steamboat.
Source:
Ash-Shaykh Ibn Jibreen
Fatawa Islamiyah, Vol. 4 Page 86