Earlier this year, Airbus Military demonstrated the capability of the A400M to operate in a multi-formation flight.
According to The Aviationist:
A unique formation, including all five of the programme’s flight test A400M next-generation airlifters, was flown by the Airbus Flight Test teams on Jun. 7, in Toulouse, France.
After the special formation flight, which did not include any particular maneuver or test, each aircraft returned to its individual activity: MSN1 performed handling quality evaluation; MSN2, wing pod hose stability tests; MSN3, engine tests; MSN4, pressurization and oxygen tests; and MSN6, function and reliability tests.
The stability in flight of the aircraft is significant and will be a key aspect of the aircraft with its maneuverability as well.
The practical impact of such multi-formation flying could well prove significant in terms of capability to insert force or support into an area of interest.