<p>When my family moved from Europe to America, our travel agent contacted the two airlines we were considering regarding their policies concerning my daughter’s carrying on her violin (which is a few inches longer than normally-permitted overhead baggage). The travel agent summarized Lufthansa’s agreement on our itinerary: she could carry it on and stow it in the overhead compartment, and that could be her sole carry-on. I felt confident that this would work (and it did), in part because we had a third party involved to help if necessary.</p>
<p>The other airline, USAirways, missed out on four expensive one-way business class fares because it either would not commit to allowing us to carry it on, or would have required us to buy it a ticket. </p>
<p>The gate agent in your example clearly misread the policy. Given the context, the last line meant–You can check a cello, but if you choose to carry it on, it has to be ticketed and travel in the seat beside you, not in the overhead compartment. Perhaps using a travel agent could be helpful for making arrangements for transporting the cello in the future, as you would have an experienced third party to back you up.</p>