See this article: http://www.bbc.com/news/business-28356745

Looks pretty heavily trafficked to me. And a lot of airlines are now saying that they will avoid that area, when they were presumably using it before.

Many did cross - even Lufthansa and Singapore Airlines. Spiegel gathered some flight data from flight radar.com. The article is in German but you can scroll to the bottom to see the list: http://www.spiegel.de/politik/ausland/malaysia-airlines-mh17...

One should note that though Air France from from Paris to Bangkok used to take the route south from the Ukraine, the KLM from AMS to Kuala Lumpur was going through the country, both later merging to the same route over Turkmenistan.

Given that Air France-KLM is a one corporation since 2004, it's pretty surprising. Paris is a bit more south than Amsterdam, but not that much.

[1] http://cdn1.spiegel.de/images/image-726710-galleryV9-ocpi.jp...

According to the linked article, Air France and some other foreign airlines were the only ones to avoid Ukraine.

Proof?

See: http://www.nytimes.com/interactive/2014/07/17/world/europe/m...

I don't know if "most" is true, but Air France and British Airways were avoiding it at least, and I recall reading Delta had been as well.