The applicable miqat depends on your route. Ask your group when the flight is expected to cross it and whether you should prepare Ihram clothing before boarding. Keep necessary items accessible and follow the guidance given for your itinerary. Do not assume that arrival in Makkah is the time to enter Ihram.
For the sequence of rites, see the official Nusuk Hajj journey. Verify personal rulings with a qualified scholar and current travel rules with the relevant authorities.
For your journey
Rites can differ by Hajj type and personal circumstances. Verify religious questions with a qualified scholar and current travel requirements with official authorities.