Sky Mark compensation
I don't work for Sky Mark yet, but there has been some slight changes which is to be expected in light of the increasing competition in Japan.
What you can count on, after 6+ months of training, is to receive a salary of $8,000 per month, after taxes for 75 hours of flying. After training, you'll spend at least 20 days a month in Japan. The Per Diem is about $1500 per month, and you'll not be able to save a huge amount from that since Japan tends to be a bit expensive. The housing is about $2600 per month, and you can rent a small apartment for that. In the past, there were other perks that the guys jumped on but were not on the contract.
So, in a nutshell, for 20 days a month and 75 hours of flying in Japan, you'll have $8,000 each month. Yes, there might be some overtime at about $100 per hour and if they get short, you can sell your days off occasionally and make some more. But, the bottom line is, $8,000 for 75 hours. You won't have to spend anything out of that as your housing, meals, and ticket home is provided.