Daily profits up and down

[RockBass14]

I cant quite figure out what is happening on a day to day basis but I will go from 7.5 mil cash on one day to 5.5 mil cash two days later and back up again.  Any key areas I should be looking at?  Attached is a screen shot of my weekly income statement. (current week is only half way done)

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[Sami]

Cash is irrelevant as some weekly expenses are paid in a certain day in week (for example salaries).

Look for the total result of previous week in income statement.

[Dazwalsh]

every 4 week your aircraft will go into B check (see aircraft maintenance) and that will cause a drop for one week in 4.