I was just wondering why Delta Airlines has 3 different c/s's still in use on their planes while airlines like AA, Continental, NWA(they're repainting), and UAL(also repainting) have only one c/s. here's an example of each:
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The old widget scheme has been around for quite some time. In 1997, Ron Allen came onboard and changed the colors to the interim "1997 colors." Then, he left and the new CEO (I think that's the position) changed the colors again! Right now, DL is in the process of transitioning to the "wavy gravy" scheme. Additionally, NW and UA are both transitioning to new color schemes. Do a photo search on a.net and you'll see these new colors.
Nowadays, airlines are usually repainting their aircraft when the jet goes into heavy maintenance. Then, the paint has to be taken off for all types of checks and controls, and afterwards the new scheme will be made on the aircraft.
As Delta and others ( Like UAL ) have very large fleets, the repainting will take several years, as some aircraft are scheduled for maintenance in the far future.
This would explain why some Delta ships are still in the old old colors.
They will get the Deltaflot scheme soon