X buys an air-ticket from Y by paying the price; Y delivers the ticket. The contract between X and the airline (carrier of X to destination) is:

1. A bailment requires DELIVERY of goods for a purpose — an air ticket itself is not 'goods'. 2. The legal relationship between passenger and carrier is one of contract of carriage / services. 3. Hence (D). _Source: ICAI BoS CA Inter Paper 2 — Indian Contract Act 1872_