I asked Air France and Lufthansa about the size and weight of luggage. Here is the answer from Lufthansa:
Dear Mr. Altounji, Thank you for your correspondence regarding our baggage allowance. Baggage allowance, for the most part, is standardized among carriers and allowance is indeed based on the metric system. Metric measures are converted to lbs. in some websites, particularly the US website. We appreciate your input and look forward to welcoming you onboard in the near future. Best regards, Antonia Romeo Sitz der Gesellschaft / Corporate Headquarters: Deutsche Lufthansa Aktiengesellschaft, Koeln, Registereintragung / Registration: Amtsgericht Koeln HR B 2168 Vorsitzender des Aufsichtsrats / Chairman of the Supervisory Board: Dipl.-Ing. Dr.-Ing. E.h. Juergen Weber Vorstand / Executive Board: Dr. Christoph Franz (Vorsitzender / Chairman), Stephan Gemkow, Stefan H. Lauer, Carsten Spohr
