The right airline for any given trip depends on more than ticket price. A $30 cheaper Spirit fare can cost $80 more once you add a carry-on and seat selection. A direct flight on a premium carrier saves an entire travel day vs. a basic-economy connection. This airline guide covers the comparisons, baggage rules, and booking sites that actually matter when choosing how to fly.
Table of Contents
How to Compare Airlines
Three things determine whether one airline is actually a better deal than another:
- Total cost, not base fare. Add baggage, seat selection, and any change fees you might use. Spirit’s $39 fare with $50 carry-on is $89; Southwest’s $99 fare with included bags is $99. These are different decisions than the base prices suggest.
- Route schedule and connections. A direct flight at the right time is worth $50 to $100 more than a 2-stop itinerary. Travel time has real value.
- Loyalty and status if you fly often. A frequent flyer who picks the airline they have status with gets free bags, upgrades, and lounge access that change the value calculation.
Airline Comparisons
Head-to-head airline comparisons help when you have a route flown by multiple carriers and need to pick one:
- Southwest vs American Airlines
- British Airways vs American Airlines
- American Airlines Main Cabin vs Basic Economy
- JSX Airlines Review (Semi-Private Hop-On Service)
Carry-On Rules by Airline
Carry-on size limits vary more than most travelers expect. The standard US is 22 x 14 x 9 inches, but Southwest is more generous, and budget carriers like Spirit, Frontier, and the European low-cost airlines enforce stricter limits with paid carry-on tiers.
- Carry-On Luggage Size Guide by Airline
- Carry-On Rules for International Flights
- Sun Country Carry-On Size
- How Strict Is Frontier With Personal Items?
- What Counts as a Personal Item on a Plane?
- Does a Diaper Bag Count as a Carry-On?
Booking Flights
Where you book a flight changes both the price and the support you get when something goes wrong. Direct booking with the airline is usually best for protection. Online travel agencies like Expedia and Booking.com sometimes have better prices but introduce a middleman if your flight cancels.
- Best Flight Search Engines
- Best Places to Buy Plane Tickets
- Booking.com vs Expedia
- Benefits of Online Check-In
Cabin Classes and Fare Types
Knowing what each fare class actually includes prevents most of the unpleasant surprises at the airport. Basic economy strips out everything optional. Main cabin is standard. Premium and business add real value but at a price.
- Flying Coach: What It Means
- Main Cabin vs Basic Economy (American Airlines)
- Upgrading to Business Class
Budget Airlines and Low-Cost Carriers
Budget airlines work well for travelers who pack light, don’t need to change plans, and just want the cheapest seat. They’re a poor fit for travelers who’d add bags, seat selection, and other amenities that come included on full-service carriers. The savings often disappear after add-ons.
In-Flight Rules and Tips
- Can You Take Cigarettes on a Plane?
- Can You Bring a Cart on a Plane?
- Complete TSA Rules
- What Can I Bring on a Plane?
For airline-specific baggage policies straight from the source, the U.S. Department of Transportation aviation consumer protection page aggregates the official rules and your rights as a passenger.
Airline Guide: Frequently Asked Questions
Which US airline has the best carry-on policy?
Southwest. Their carry-on size limit (24 x 16 x 10 inches) is more generous than the 22 x 14 x 9 standard at most other US carriers, and a carry-on plus a personal item is included free in every fare class, including their basic Wanna Get Away tier.
Is basic economy ever worth it?
For short flights with a single carry-on or under-seat bag, basic economy can save you $30 to $80. The tradeoffs: no seat selection until check-in, last boarding group, and limited or no changes allowed. If you have flexibility on seat assignment and don’t expect to change your plans, it can make sense.
What’s the best site for booking flights?
For domestic US travel, Google Flights and Kayak are the strongest search tools, and booking direct with the airline is the safest. For international, ITA Matrix and Skyscanner are good for finding deals. Avoid booking flights through hotel-focused OTAs (like Booking.com) when you have specific airline status or refund needs.
Are budget airlines worth it?
For light packers traveling on flexible plans, yes. For families, business travelers, or anyone who’d add bags, seat selection, or change protection, the math usually favors a full-service carrier once you add up the fees.
How early do I need to arrive at the airport?
For domestic US flights, 90 minutes before departure is enough at most airports. International flights need 2 to 2.5 hours. Add another 30 minutes if you’re checking bags or flying out of a notoriously slow airport (LAX, JFK during peak times).
What’s the difference between a personal item and a carry-on?
A personal item is the smaller bag (purse, small backpack, laptop bag) that fits under the seat in front of you. A carry-on is the larger bag that goes in the overhead bin. Most US airlines allow both for free; budget carriers may charge for the carry-on.