Check luggage limits and pinpoint other travel details with these two helpful web sites:
1. LuggageLimits.com: Spirit Airlines has already announced that it will charge as much as $30 each way for carry-on bags too big to fit under the seat. Will more airlines do the same? On this site, search for specific baggage information based on airlines and airports.
2. VirtuallyThere.com: You can’t buy your ticket on the site, but you can find real-time flight updates to see whether a business traveler is on track. Plus, you can download trip plans to your computer and share with colleagues via e-mail.