@article{orthogonalityanddimensionalityinairlinec,
  title = {Orthogonality and Dimensionality in Airline Cluster Analysis using PCA and Kernel PCA},
  author = {Andreas Schlapbach},
  year = {2026},
  eprint = {2606.08322},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.08322},
}