There are a few things that make this game different from long games.
- There is little LH demand.
- There is a lot of SH and MH demand.
- It ends in 1967.
The fuel prices are stable and low until 1967. Having a first generation jet in the early 1950's makes sense. The Comet can do 3 routes (500 NM to 1000 NM) between 5am to 11pm vs 2 for the Viscount for instance. The Comet will "grow" in seat capacity with the next versions, easy to transfer the schedules. Also, if the player wants to use 707s / DC8s in the 1960's the schedules will easily fit.