FACTBOX - Airlines on front line of swine flu scare

(Reuters) - Airline and leisure stocks have fallen globally as concerns increase over the spread of swine flu, which has killed more than 100 people in Mexico.

The European Union's health chief urged citizens on Monday to avoid non-essential travel to areas affected.

Airlines body IATA said it was monitoring the situation.

About 1.4 million passenger seats are flow into or out of Mexico each week, according to data supplied to Reuters.

Among foreign airlines, those immediately at risk from any travel slowdown to and from Mexico are the major U.S. carriers followed by Canada and Europe, with Asia lagging well behind.

Below is a breakdown of weekly airliner capacity into and out of Mexico, ranked by the number of seats on sale.

The data was supplied to Reuters by Innovata, a British company which tracks airline schedules on behalf of IATA.

The first column of data shows the number of one-way flights operated each week to or from Mexico (a round-trip counts as two trips). Column two shows the number of seats on sale each week.

(Note: 44 airlines operate internationally to/from Mexico. The list has been edited to exclude some regional operators.)

Weekly flights Seats

1. Mexicana 2,876 319,116

2. Aeromexico 3,526 285,887

3. Volaris 655 94,810

4. InterJet 631 94,650

5. Continental 1,002 89,074

6. American 598 78,328