I would think any smart airline would hire foreign nationals, especially on international routes where you would need F/As to communicate well with the passengers. For example, on Delta's ATL-GRU route, about half of the F/As are Brazilian for the passengers who can't speak English.
To add to above list, Qatar Airways also has on - almost all flights I think- several nationalities represented. During pre take off announcement they announce language spoken and it's more than the "destination-origin" language. e.g french on a DOH - MLE leg.
This should be very appreciated by passengers who don't speak english.