The phrase "already in flight" is correct and usable in written English.
It can be used to describe something that is currently underway or in progress, often in the context of travel or a process that has started.
Example: "The package is already in flight and should arrive by tomorrow."
Alternatives: "currently en route" or "in transit."
"The minute a suicide bomber has a bomb, he is a weapon that is already in flight.
Temporary setbacks, part of the process of changing quarterbacks, from Vinny the Ancient to The Next Namath, with the season already in flight.
We were determined to try; we analyzed data all night before the event, and had in place a plan to call and email to SOFIA while they were already in flight, with a last-minute course correction.
The only one she can find shows Araceli in the background, her figure dim and blurred, suggesting "something furtive about its subject, as if she were already in flight when it was taken".
Earlier this month, in response to the crash, Boeing issued a bulletin instructing pilots that in the event the nose is pushed down erroneously, which can be triggered by problems other than the MCAS, they can use procedures that are already in flight manuals to turn off autopilot and the pitch trim system and to adjust the pitch manually.
The real reason was that the aircraft was inferior to the MiG-15 already in flight testing.
And if you're jumping out of bed, already in "fight or flight" mode, you're setting a stressful tone for the day.
Mr. Kincaid says the airlines he flies already offer in-flight exercise videos aimed at reducing the risks of D.V.T. "The videos are there," he said.
However, even in these cases, the eyes were in a pre-determined location prior to the critical saccade – that is, in this study (like the others based on visual triggers), there was minimal noise due to the oculomotor system being "in flight" (i.e. already shifting attention and gaze due to a combination of exogenous and endogenous factors by the time of the trigger; see below).
The company is already engaged in flight training and maintenance of naval bases for Britain's armed forces as well as rail infrastructure engineering and network services for the power and telecoms industries.
In a lengthy story on Politico, Ben White and Marc Caputo reveal the truth: the Bush campaign is already in full flight, but for now it is concentrating on one-per-centers rather than on the electorate at large.
