Jeddah is not a Miqat
Question :
Some people give Fatwa (i.e., religious ruling) for the person who arrives for Hajj by air that he may assume Ihram from Jeddah and others are against that. So, what is the correct position regarding this issue? Please give us a ruling, and may Allâh reward you.
Answer:
What is obligatory upon all of the Hajj pilgrims, whether they come by air, sea or land, is that they assume Ihram from the Miqat that they pass by land or what is equivalent to its distance by air or sea. This is due to the Prophet's statement when he designated the Mawaqit:
"They are for them and whoever passes by them from other than their people, from those who intend to perform Hajj and "Umrah."
This Hadith is agreed upon.
Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 4 Pages 89-90