Originally Posted by Timbo

That's because the 737, the 767 and half of the 757's were all South jets and had the one cup Clarks. We south guys bought our own headsets back when they were required, vs. wearing that pos Clark head clamp that the company bought for our jets. We rarely use the Clarks.

The Airbus' were NW airplanes, and had the nicer Telex 750's which are much more comfortable, so they used those vs. buying their own. (that was the one I bought for my personal use).