ITN allows you to choose multiple "favorite" airlines, and I believe the others do, also. If you select CO & NWA in the "favorite" area and then select the maximum # of flights, you will find itineraries that will include both airlines. To select multiple airlines, hold the "Ctrl" key and click on the airline of choice.

[This message has been edited by JAWS_II (edited 01-21-2001).]