A:
The Ihram should be adorned at the Meeqat, although some Ulama have allowed one to don the Ihram in Jeddah, other Ulama have regarded Jeddah to be within the Meeqat. Hence it is more precautious to adorn the Ihram before arriving at Jeddah when the Meeqat boundary is announced on the aircraft.
Mufti Shafiq Jakhura
Iftaa Department, Darul Ihsan Islamic Services Centre
I concur with the answer:
Mufti Zubair Bayat
Ameer, Darul Ihsan Islamic Services Centre