This is how airlines price tickets

Many of us this summer will fly off on holiday for a well-deserved break. It's more than likely that you spent hours on the internet researching flight deals, trying to figure out an airfare pricing system that seems completely random.

Fees appear to fluctuate without reason and longer flights aren't always more expensive than shorter ones. Cheap Flights from Siem Reap to Shanghai But what seems random is actually airlines' dynamic pricing, using a strategy called airline revenue management.

It works in real time with one aim — to boost revenues. The decisions are being made by an algorithm that adjusts fares by using information including past bookings, remaining capacity, average demand for certain routes and the probability of selling more seats later.It's a far cry from the first years of commercial aviation when the industry was a tightly regulated marketplace. Most international routes were operated by a single national carrier and the lack of choice resulted in uncompetitive fares for consumers.

Deregulation, however, changed all that, removing government controls over routes, fares and market entry for new airlines.

Critics say there was too much competition in the first years after deregulation. Airlines lost a lot of money, forcing them to merge and became more dominant. They say this changed the industry from a regulated cartel to an unregulated cartel. In the U.S., just four airlines control 68 percent of the domestic airline capacity.

But this hasn't halted the demand in air travel.

The number of airline passengers across the globe has continued to grow, particularly in the last 10 years, when the amount of people choosing to fly skyrocketed by nearly 1.8 billion.