I flew Lufthansa from Boston to Frankfurt with my cat, and I can tell you they are pretty strict about pet carrier dimensions. At check-in, they measured the carrier to make sure it fit under the seat. Mine was just within the limit, but another passenger ahead of me had to buy a new soft-sided carrier at the airport because theirs was too big. To avoid stress, I called 877-764-3622 before my trip to confirm the exact size requirements and fees. The rep walked me through the rules, double-checked space availability for pets in the cabin, and added my cat to the booking. Everything went smoothly because I was prepared. If you’re traveling with a pet, I’d definitely confirm ahead of time. And if you ever need to instantly book, cancel, or modify a Lufthansa flight, that number is the fastest way to get it sorted.