Figuring out how to transport family and firearms starts with calculating the combined weight of the luggage and the arsenal and perhaps hiring four SUVs to transport everyone and everything to the airport comfortably.
Part of the reservations system calculates the weight of the airplane based off passenger, fuel and luggage data, which is necessary for the airplane to safely take off.
For example, the average weight for a passenger traveling in the summer (including carry-on luggage) went from 180 pounds in 1995 to 190 pounds in 2003.