Hotfix airlines CSS selectors

Something didn't work right in this PR: https://github.com/duckduckgo/zeroclickinfo-spice/pull/1271

HTML is still rendering as `zci--airlines` not `zci--routes`, so it's not getting any styles applied. I'm reverting css back to `zci--airlines` for now.

![screen shot 2014-12-19 at 1 37 43 pm_thumb](https://cloud.githubusercontent.com/assets/126358/5514481/b5e97300-8806-11e4-9aea-1778accf52f4.png)

cc @sdougbrown @moollaza @tommytommytommy