The 787 program is now in a state where it generates significant revenue and margin. The other programs, the 767 and 747 freighters, the 737NG (P-8A Poseidon) and 777 Classic make up less than 45% of deliveries with the 787 covering 55% of deliveries, and these programs are in phases where they deliver less margin.
The 787 program accounting employs different accounting block production costs for the different 787 variants.
The 787-10 carries the highest accounting block cost and is accordingly the most important variant for the payback of the deferred costs.
The 787-8, despite leading the program, generated the largest deferred costs (due to learning curve effects), amortizes the least of the variants.