Viking Global Application Question

not actually applying, but chanced upon an interesting sample question on their careers website. Interested to know how experienced hedge fund/LO investors would answer this question:

“Which of these businesses has the best business model (and why)? An airplane manufacturer (e.g., Boeing), an airplane lessor (company that owns airplanes and leases them to airlines), an airline (e.g., Delta), or an online travel agency (e.g., Expedia)”

Thanks!!