The ruling on delaying Ihram until reaching Jeddah
Question :
A man intends to perform Hajj or 'Umrah and he puts on his garments of Ihram on the airplane. Then, along with this, he does not know the place of the Miqat. Can he delay the Ihram until Jeddah or not?
Answer:
If he intends to perform Hajj or 'Umrah by air, he may bathe in his home and put on the waist garment and the upper garment (at his home), if Allâh wills. Then, when there is only a short amount of time left before reaching the Miqat (i.e., while on the plane) he enters the state of Ihram for whatever he wants to perform, whether it is Hajj or 'Umrah. There is no hardship in that.
If he does not know the Miqat, then he should ask the plane's pilot or one of the plane's crew or one of the passengers who is reliable and has information about that. And success is from Allah. May Allâh send blessings and peace upon our Prophet Muhammad, his family and his Companions.
Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 4 Pages 90-91