I am not traveling until August, so this particular warning didn't affect me. But, even as a sophisticated traveler, I don't "understand" what they are saying. If I had gone to LAX, for a two week trip where I am meeting family in Italy, with my checked bags (an hour from my home), and walked to the check-in line for KLM (2 hours before my flight, because that is reasonable for business class), I don't understand what would have actually happened. They would have refused to check me in? I was supposed to leave my suitcases for 2 weeks at LAX? They would have suggested that I stay in a hotel and go the next day once the warning expired? (They don't have 2 business class even available from LAX-AMS-Italy most days this summer.)