OK, inclement weather grounded the chopper, and a desire to be mindful of local traffic disruptions was put out there to explain his absence....plausible.... but why not walk with all the other leaders down the Champs Alysees to the Arc de Triomph?
Then, on Veteran's Day, back home... WH didn't bother with an explanation for the President not making a visit to Arlington on Veteran's Day, a holiday when traffic is usually light and the weather was clear. It's like Trump doesn't even want to bother with any of the pomp and circumstance associated with the military that historically were an important part of the job of POTUS...
any honest con, to whom respect for the military is a primary form of patriotism, would admit that if Obama did either of these, let alone all of them, there would be exploding heads everywhere...