Skylow.com is a promising new site that claims to find the cheapest fares among 64 low-cost carriers for 8,700 city pairs in 84 countries.

The volunteers looked at flights between 73 city pairs involving 28 cities.

The analysis also showed huge variations among airlines serving the same city pairs.

The data cover all the domestic nonstop flights by the 10 airlines, and are organized by city pairs.

Prices are mileage-based or based on city pairs.

Authority is only granted to operators of two-engine airplanes between specific city pairs.

The number of city pairs served by one carrier, on the other hand, has remained fairly constant.

It carries 75 passengers and can link almost any imaginable city pair on the globe.

But some sites continually scan specific city pairs and post the top results on your home page, regardless of price or promotional status.

When the shuttle is fully operational, it will connect 14 city pairs.