This post shares information on how to get airlines logos and country flags.                        

Airline logos

Logos for all

Logos of airlines are available at the URL:

http://pics.avs.io/width/height/iata.png

where width - the width of the logo, height - the height of the logo, and iata - the IATA code of the airline. The size can be anything.

For example: http://pics.avs.io/200/200/UN.png.

Logos for retina

To get logos for iOS in retina resolution, use the additive @2x in the link to the logo:

http://pics.avs.io/122/56/{IATA}@2x.png.

For example: http://pics.avs.io/200/200/UN@2x.png

If you are looking for square or vector airline logos check it out on Airhex: https://airhex.com.

Country flags

The flags.zip archive contains images of country flags in eps format.