This will allow you to compare the profits associated with each fleeting.
An example of a time-space network can be found on page 188 of "The Global Airline Industry". Label each time-space network as either Fleet Assignment 1 or Fleet Assignment 2.
For Fleet #1, choose 1 aircraft type and assign it to one of the flight numbers in Table 1. Continue assigning aircraft to flight numbers until all aircraft are utilized and all routes have been assigned. Be careful to make sure that the route you assign to a particular aircraft is feasible; consider return trips and departure times. Also, be sure to indicate which aircraft type is associated with each flight number on your drawing.
For Fleet #2, take your duplicate foundational schedule map and assign different aircraft to the scheduled routes, repeating the steps above for Fleet #1. Change it up!
Now, calculate the profits associated with each fleet assignment. Refer to the figures in Table 3 to locate the various amounts associated with aircraft types and flight numbers. Indicate your profit total at the bottom of your Fleet Assignment drawings. (Be sure to include your name on them too!)