A foreign-supplied aircraft is pretty much guaranteed to be filled with listening devices, and won’t have the protective measures that are built into the US Air Force One. Not to mention the bribery problem with planning on using it for personal use after leaving office.
Expressly forbidden by the Constitution:
Article I, Section 9, Clause 8:
No Title of Nobility shall be granted by the United States: And no Person holding any Office of Profit or Trust under them, shall, without the Consent of the Congress, accept of any present, Emolument, Office, or Title, of any kind whatever, from any King, Prince, or foreign State.
No presents without Congressional approval. We know Congress is a bunch of spineless removed, but they have not given permission. Nor should they.
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reread i9-8. and i mean reread the entire thing. not just the part where you stopped reading last time
You are incorrect. The second sentence says office holders cannot accept presents without Congressional approval.