Fuselage flex?

Date:         10 Feb 2000 05:03:45 
From:         jmaddaus@NO_SPAM.usa.net (John S. Maddaus)
Organization: AT&T WorldNet Services
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Been riding some of United's 727s lately and couldn't help but notice
that on every one the emergency floor lighting strip separated from
the floor a good inch or so in height just behind row 14 (just in
front of the first window exit) at altitude.  I watched the last one
throughout the flight and it gradually returned to floor level upon
initial descent.  No separation while on the ground.  Question - what
causes this?

Also on a recent trip to Pima, I was told that the design of the
Connie's fuselage was intended to provide additional lift.  Can anyone
confirm this?