Question Summary:
Niyyah before crossing the Miqat

Question Detail:

the flight when we are just about to cross the miqat. Since the plane flies so fast there is a fear that we may not be able to complete the niyat and Talbiya exactly over the place of miqat because of such a short time.So is it ok to commence making the niyat about 5 mins before the plane crosses the miqat ? 

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
It is not necessary to make niyyah of ihrām at the mīqāt. It is best that one makes niyyah well before approaching the mīqāt. One may even make niyyah from the time he leaves home.[1]
And Allah Ta’āla Knows Best
Hisham Dawood
Student Darul Iftaa
Chicago, USA 
Checked and Approved by,
Mufti Ebrahim Desai.
Daruliftaa.net