Various cheats:

Code                    Result 
atmissall               All Missions 
donaldtrump             Extra Money 
expander                Larger Airfield 
mentat                  All Helpers Activated 
nodebts                 No Debts 
showall                 All Flights Visible 
thinkpad                Notebook 
winning                 Complete Mission 
missioncrowd            Crowded Airfield 
runningman              People Walk Faster 
famous                  Better Reputation 
crowd                   More People Fly With Airline 
panic                   All People Leave Airport