What do I pay for? My brother and I were on the phone looking up rates to fly to Phoenix for me to see him. I won't mention the Airline, but we found awesome rates. $120 dollars and we screamed, ok we didn't, but we were really excited. Fly my whole family out for 500 bucks!! Then there were taxes, fees, baggage fees, seat fees, breathing fees (ok, that one I made up...but it's coming). Now, new rules, you can know what you are paying for.

Will the New Full-Fare Advertising Rules Apply to Vacation Packages?

Yes—that is, if the packages cover airfare. Travel providers (including both online and brick-and-mortar travel agents) will have to include mandatory flight taxes and fees in package costs as long as the trips include flights. Two popular vacation booking sites have already publicly addressed this issue: Apple Vacations and Go-today announced price modifications on their websites. According to Apple Vacations, "Effective January 26, 2012, all Apple Vacations' advertised pricing will change. The price you see in our advertisements will be the complete cost of the vacation including all taxes and fees associated to the airfare."

How Will Travel Booking Sites and Online Travel Agencies (OTAs) Be Affected?

Just like the airlines, travel booking sites (like Intrepid Travel and Monograms) and OTAs (like Expedia, Orbitz, and Travelocity), have to include mandatory flight taxes and fees when advertising airfares.

How Will Fare Aggregators Be Affected?

Fare aggregators such as Kayak and our sister site TripAdvisor Flights already include taxes and fees in their listings. A spokesperson from Kayak told us, "The new ruling has not changed how we display fares. Before the DOT full-fare advertising rule, Kayak had already been displaying fares with full taxes and fees included." So basically, there's nothing new here.

Will All the Airlines Roll Out Fee-Inclusive Fares Right Away?

Most likely. We're already seeing fee-inclusive fares (as well as vacation packages that include airfare taxes and fees) on Southwest, JetBlue, United, and Continental. Spirit Airlines—the carrier notorious for its excessive fees—has yet to post fee-inclusive airfares on its site. We've reached out to Spirit Airlines for a comment, but have yet to hear back from the airline.

What Other Rules Will Go Into Effect This Week?

The DOT's new full-fare advertising rules are part of a larger of group of airline passenger protection regulations that kick in this week. The following rules take effect today (Tuesday, January 24):

• Passengers will have the option to change or cancel a reservation within 24 hours of initial booking (as long as the ticket purchase is made at least a week in advance of departure).
• Airlines can no longer increase the price of a ticket after it's been sold.
• The airlines will have to inform passengers if a flight will be more than 30 minutes late.
• Airlines will be more upfront about baggage fees. Costs for baggage must be displayed on the "first screen containing a fare quotation for a specific itinerary," says the DOT. Baggage fee amounts must also be displayed on electronic ticket confirmations.