B0 has been used for taxi runs
B1 is the first flight.
B+ are Boeing test flights to fix problems found on previous B flight(s).
One Boeing is happy it is handed over the Customer for testing.
C1 is the CUSTOMER acceptance testing.
Customer runs through a customer specific list of tests.
C+ are Customer test flight to check fixes from the previous C tests.
Delivery consists of signing document and transferring of funds.
I think (could be wrong) that the load date was when it was added to the spreadsheet.
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