Praise be to Allah.
If a person wants to do Hajj or ‘Umrah and he is coming by plane, he can do ghusl in his house and put on the izar and rida’ (ihraam garments) if he wants. Just before the meeqaat, when there is short distance remaining, he may enter ihraam for whatever he intends to do of Hajj or ‘Umrah. This is not difficult. If he does not know where the meeqaat is, he should ask the pilot or one of his assistants, or one of the air stewards, or a passenger whom he trusts and who has experience of that.
And Allah is the Source of strength.