Sometimes it is not flying because of maintenance, sometimes it could be cancelled, sometimes it is suddenly back on report for the last three weeks, so you can check then.
Worst thing is you didnīt earn a revenue, but thatīs happening with other flights, too.
Itīs some technical problem which keeps me from opening 7-day schedules, I like to check everything fequently and with those flights you canīt.
Itīs because 7-day scheduling was evaluated later by the players, it was not intended while game was coded.
Maybe Sami will work with the report system to make once-a-week flights more valuable.