Thank you, I will look it up. I wonder what the success rate was for those, I thought they sometimes went to backup locations. I read accounts of using airship

Thank you, I will look it up. I wonder what the success rate was for those, I thought they sometimes went to backup locations. I read accounts of using airships in the exploration of the North in the early 20th century and I got the impression that they often dropped ropes in a clear spot away from the exact landing point and were led by a landing team to the final docking, which would be hard to do in the middle of a city today.