Look, that's your profit/loss for the month which in this game is close but not quite the same as cash flow.
If you want to know how much cash you'll have by the end of the month and use the information on that page do this: from that number on the bottom right (total for the month) deduct the left column (how much you've already made or lost). This will be close (but not quite) to how much more money you'll get. Add this number to your current cash.
Say you have €10,000 in cash, the bottom right of the finance page says €10,000 and the Month To Date columns says minus €5,000 (a loss). Then you're expected to make €15,000 until the end of the month. Add those to your €10,000 in cash and you get €25,000 expected by month's end.
More important than cash in hand at the end of the month if cash on the first day of next month, to see if you can cover your fixed expenses (gates, maintenance, leasings) withouth going into red. Assume the last three non-grayed figures on the right column will be the same next month. Except for aircraft maintenance because, even if you didn't buy any new ones, the older they get the more they cost in maintenance.