On Mon, 08 Oct 2007 21:43:27 -0400, Mike wrote
in :

The biggest cause of flight delays is the airline scheduling and use of
more Regional jets on the same runways... RJs take essentially the same
runway space as traditional jets and only carry 1/4 to 1/3 as many
passangers. More airline flights trying to use the same runways, so
something has to give.

It would appear that the majority of Boeing's airliner production is
the 737 (118 to 215 seats*) currently:

Boeing Reports Third-Quarter 2007 Deliveries

CHICAGO, Oct. 04, 2007 -- The Boeing Company [NYSE: BA] today
announced deliveries across its commercial and defense operations
for the third quarter of 2007.

Major program deliveries during the third quarter were as follows:

Major Programs 3rd Quarter
2007 Year-to-Date
2007
Commercial Airplanes Programs
737 81 250
747 5 12
767 3 9
777 20 58
Total 109 329

Integrated Defense Systems Programs
Apache (New Builds)
9 17
Chinook (New Builds)
1 7
C-17
4 12
C-32/C-40 0 2
F/A-18E/F and EA-18G 11 33
Satellites (Government & Commercial) 1 4
T-45TS 2 7
F-15 3 6
Delta II - Commercial 1 2
###


* http://en.wikipedia.org/wiki/Boeing_737