For airliners, there is only one sure defense against the kind of missile linked to the shoot-down of a Malaysian jet over Ukraine: staying out of range.
I can't say that I disagree. I mean, I certainly understand why Israel-based airlines installed countermeasures in their planes, but look, it would cost north of USD 40 billion to equip US-based airlines. For what result? Detect all the missiles you want, a civilian aircraft won't be able to fully do evasive maneuvers. If someone is determined to shoot an airliner down, the airliner will go down.
In other words, I'm fully with what Tim Clark, Emirates' president, declared:
If we can't operate aircraft in a free and unencumbered manner without the threat of being taken down, then we shouldn't be operating at all.