Here's how to avoid the worst seat on the plane

Flickr/ Austrian Airlines

The middle seat — especially in coach — is one of the most dreaded and common scenarios in flying.

It's cramped, it's inconvenient, and it's often the only seats available on flights — particularly if you book at the last minute.

In the past, an easy way to ensure you get an aisle or window seat is to book flight early.

However, airlines have figured out that their customers have an almost universal hatred for the middle seat.

Not only that, airlines have come to realize that many are actually willing to pay to avoid it.

For instance, Delta's cheapest tickets these days fall under its Basic Economy class which only allow passengers to select their seats after checking in — at which point the window and aisle seats are likely to be already gone.

This means, passengers will have to buy more expensive main cabin tickets in order to select seats at the time of booking.

On the other hand, Southwest — which doesn't assign seats — charges passengers $15 for the privilege of boarding early.

Although it is impossible to completely rule out the possibility of ending up in the middle seat, there are several ways to avoid it without having to pony up extra dough.

First, in spite of the revenue generating fees airlines have come up with, booking early is still the best way to ensure you don't end up sandwiched in the middle. In addition to an increased likelihood of getting an aisle or window seats, booking early will also net you cheaper ticket prices.

Flickr/ Austrian AirlinesAccording to a study by Expedia, the average price of tickets are its lowest 57 days ahead of the flight. Further, the study also showed that those buying tickets more than three weeks in advance on flights within North America can expect to see savings of roughly 43-56%.

In fact, savings from cheaper tickets prices may allow you to "splurge" on the fees for aisle or window seats. 

Second, the plane used to operate the flight makes a big difference as well. These days, the Boeing 737 and Airbus A320 along with their many derivatives dominate the short-to-medium-range market. Both aircraft are generally configured with six-abreast seating or six seats per row with two sections of three seats divided by a single aisle. This results in two middle seats per row. 

However, there are ways to reduce the likelihood of ending up in the middle seat by taking flights using planes with fewer or no middle seats on board. 

Flickr/ Austrian AirlinesInstead of the 737 and A320, look for flights using McDonnell Douglas MD80 series, MD90 and Boeing 717 jets. These aircraft feature five-abreast seating in a 3-2 configuration. This means there is only one middle seat per row. However, these aircraft are aging and their operators working quickly to replace them with planes that are newer and have more seats. 

In the US, the MD and 717 aircraft are mostly operated by Delta Air Lines, American Airlines and Allegiant. 

Another option is to take flights operated for the major airlines by regional carriers under names such as Delta Connection, United Express and American Eagle. These flights are generally operated using regional jets or turboprop airliners. 

Although they are smaller and more cramped, regional aircraft are generally setup in a 2-2 configuration which means there are no middle seats. Here, look for aircraft such as the Bombardier CRJ and Q400 as well as Embraer E170 and E190 series.

Flickr/ Austrian AirlinesChoosing a flight based on the airplane also works on long haul international flights. These flights are commonly operated by wide-body, twin aisle airliners such as the Boeing 777 as well as the larger Boeing 747 jumbos and the Airbus A380 superjumbos. 

These large jets are generally setup with nine or even 10-abreast seating in a 3-4-3 configuration with four middle seats per row in coach. 

For flyers looking to avoid middle seats on long haul flights, there are several types of aircraft they should hone in on. First, Boeing's venerable twin-engine 767 wide-body is still around and can commonly be found with a 2-3-2 configuration. That means there's only one middle seat per row in coach. It should be noted, however, that many of the 767s are pushing 20 years of age and like the MD80/90, airlines are in the process of replacing them with planes that are newer and have more seats. 

Flickr/ Austrian AirlinesIf you want to fly on something more current, look for flights operated by the twin-engine Airbus A330 and its four-engined sibling, the A340. These airliners feature eight-abreast seating in a 2-4-2 configuration. As a result, the A330/A340 generally fly with only two middle seats per row in coach. 

Fortunately, for flyers, the A330 one of the most popular wide-body airliners in the world and is still rolling off Airbus production lines. 

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