Boeing flight identifications - Boeing 747 | information center

Boeing A and B and EWA flights, often used in various blogs.

B = Boeing. C = Customer, Delivery would be a 'C' flight obviously.But it is not  (:  

B1 is the first flight.
C1 is the first customer acceptance flight.

• After Boeing satisfied that the Aircraft can be presented to the Customer, the Airline will send Pilots and Cabin representatives to make sure the Aircraft is working as intended and that the Cabin Experience is excatly like they ordered it. This is what is called the Customer Acceptance Flights and usually start from the Delivery Centers.T he C-1 flights are still operating under Boeing's Production Certificate and not the airlines' operating certificate. The flight is conducted according to Boeing rules, with Boeing pilots on board in addition to pilots (sometimes) from the airline. Some airlines designate Boeing to conduct the C-1 flight without them, however the production certificate allows customer airline pilots to fly the aircraft on C-1.
  

• Delivery flights are operated by the airline after they have taken possession of the aircraft - almost always under a special flight number for the ferry flight. For example ANA9397 is a number used commonly on the delivery flight of ANA widebodies. Technically it isn't a "delivery" so much as the customer coming to collect the aircraft and fly it to their base of operations with their own crew. Some airlines however use an aircraft delivery contractor to get the plane home. Up until a few years ago all the HNA Group aircraft were ferried to China by Global Aircraft Delivery at Seattle. It's a little more confusing for BBJ's and military aircraft as those don't go through the same process, but this is how it goes for Airlines.
  

• An EWA flight is a pre-planned flight test for some purpose beyond the production checkout. They come up really commonly whenever a new cabin configuration or IFE (Inflight Entertainment System) upgrade comes out.