When the plane containing Illya in the luggage compartment was landing, it was clearly a propeller plane (Convair) but jet engine sounds were heard. But on the ground when the luggage was being unloaded it was a jet plane (Boing 707).
With it being just a few minutes before the laser takes out the Louvre, it seems highly unlikely that Waverly would be in the building knowing he could soon be blown up.