Northwest Airlines has expanded its online flight booking tool at nwa.com to include car rentals, hotel reservations and travel insurance so you can now make all of your travel arrangements in one transaction. After choosing a flight, members can search from more than 25,000 hotel properties and six car rental companies and more activities and services will be added soon. Each WorldPerks partner will display a mileage offer on the booking page so members can see how many miles they will earn before making reservations and customers who have already purchased tickets can add extra amenities at nwa.com.