The recent announcement that American Airlines and US Airways plan to merge has sparked fears that consolidation will lead to less competition and higher airfares. Assuming the merger is approved, more than 80% of domestic capacity will be controlled by just four airlines: the new American, United Continental , Delta Air Lines , and Southwest Airlines . All four will have been created by mergers within the past five years. Delta started the most recent round of consolidation by merging with Northwest, followed several years later by the merger of United and Continental and Southwest's acquisition of AirTran.

This history of airline consolidation means we have a substantial amount of evidence about the effects of airline mergers on airfares. The days of so-cheap-you-can't-believe-it airfares are probably gone. However, that's a good thing, because irrationally priced airfares have resulted in trips to bankruptcy court by numerous airlines over the past three decades. Yet surprisingly, airfares have been quite stable in the face of rising oil prices since 2000. Airline mergers (and bankruptcies) have generated significant cost savings over time, allowing airlines to become profitable without raising fares beyond historical inflation-adjusted levels.

Stability in a sea of change
Since 1995, the average domestic airfare has risen from $288 to $367. The increase hasn't been linear: Airfares spiked from 1996 until 2000, before dropping off for much of the next decade. Since 2009, airfares have been on the rise again.


Source: U.S. Department of Transportation

However, if we adjust for inflation, it turns out that airfares have declined since 1995. Q3 2012 airfares averaged just $243 in 1995 dollars, down more than 15% since 1995 and down more than 18% from the inflation-adjusted peak in 2000.

There is a catch, though. Department of Transportation statistics include only the base airfare. Non-ticket charges such as baggage fees aren't included. Since airlines have been charging baggage fees for only about five years, the DOT statistics understate the increase in airline prices. On the other hand, the DOT also provides statistics on the percentage of airline revenue derived from ticket sales. Working backwards from this information, it appears that the average ticket price last summer including new fees was $294 in 1995 dollars, implying that fees for checked baggage, seat selection, and the like average around $50 -- roughly the cost of checking one bag for a round-trip flight on most airlines.

At $294, the average inflation-adjusted airfare is still slightly below the 2000 peak of $297, but slightly higher than the 1995 level of $288. Given the turmoil that has shaken the industry in the past decade, the long-term stability of inflation-adjusted airfares is surprising.

Rising oil: no problem
It's particularly remarkable to look at the trajectory of average airfares from 2007 to 2012. The average price of Brent crude skyrocketed over that period, from $72.44 in 2007 to $111.63 in 2012 (with a violent dip in 2009). Since jet fuel is the biggest cost item for most airlines, it wouldn't be surprising to see airfares rising in tandem with fuel prices. However, nominal airfares increased just 12% from Q3 of 2007 to Q3 of 2012, even as the price of Brent crude rose by more than 50%.

Q3 Airfares vs. Average Annual Oil Prices, 2007-2012

Oil price data courtesy of the EIA.

This data again leaves out the substantial increase in non-ticket revenues, such as baggage fees. However, even if we add approximately $50 to the average ticket price to cover baggage fees, the average fare would still have risen only half as quickly as oil prices. In other words, recent increases in airfares, including bag fees, have more to do with rising oil prices than airline mergers.

What's going on?
While airline mergers have resulted in capacity rationalization over the past few years, it hasn't caused airfares to rise. The main effect of capacity rationalization has been preventing further decreases in inflation-adjusted airfares. Airlines benefit from mergers through cost savings and new route opportunities, which can be quite substantial: American and US Airways expect to see $1 billion in merger synergies over the next few years.

However, in the old hypercompetitive airline industry, airlines would have given away these synergy benefits to customers by reducing airfares in the hope of gaining market share. Today, airline executives are being smarter about pricing. They're using cost synergies to offset fuel price increases and letting the rest flow through to the bottom line. Meanwhile, average airfares have generally remained steady, after adjusting for inflation.

Conclusion
The days of the ridiculously cheap airfare may be gone. Airline executives now realize that pricing below cost is a disastrous strategy. However, consolidation hasn't made plane tickets unaffordable. Adjusting for inflation, base fares are substantially below 1995 levels; after accounting for new fees for checked baggage and other amenities, inflation-adjusted airfares are only slightly higher than 1995 levels. Considering the substantial rise in oil prices since then, this is a very good outcome for consumers.

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The article Are William Shatner and Cheap Plane Tickets Gone Forever? originally appeared on Fool.com.

Adam Levine-Weinberg is short shares of United Continental Holdings and also has long September 2013 $33 puts on United Continental Holdings. The Motley Fool recommends Southwest Airlines. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

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