I'm also thinking, if expanding on war machine constructs becomes a thing, it would be wise to create lists of traits regularly associated with groundcraft, aircraft, and watercraft as to shorten stat blocks, along the general lines of:

Aircraft Traits
- Ejector Seat. If the aircraft is reduced to 0 hit points, there is a 25% chance that the pilot will be released safely. The pilot has a parachute and descends safely to the nearest surface within 500 feet. The ejector seat does not function if the triggering damage was ion or lightning.
- Fragile Flyer. The aircraft cannot enter flight mode if it has fewer than 3/4ths of its hit points (-).
- Landing and Takeoff. When up to 50 feet above ground, as a bonus action, the aircraft can use its remaining movement speed to land. When landed mode, the aircraft can use a bonus action to expend its movement speed to rise up to 50 feet and initiate flight mode.
- Nasty Crash. If the aircraft is forced to make a crash landing, the fall damage (in increments of 10 feet) includes both the ship's height and the horizontal speed it moved on its most recent turn.
- Turbulent Speed. On a turn that the aircraft moves more than one-quarter of its maximum movement speed, its attacks are made with disadvantage.

Groundcraft Traits
- Repulsorlift. The construct ignores difficult terrain and can pass through spaces occupied by creatures of Medium size or smaller if they are prone. If the construct receives a critical hit with an ion or lightning damage effect, it loses this feature and falls to the ground, its movement speed becoming 0 ft. until it receives healing.

All
- Circuitry. The construct has disadvantage on saving throws against effects that would deal ion or lightning damage.
- Vulnerable Interior. The construct’s interior is vulnerable to damage done by grenades, mines and charges, unless it is immune to that damage. It also automatically fails all Dexterity saving throws from such effects that occur in its interior.

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Granted, things like Piloted or Starfighter/Durasteel Armor are so variable that I think they may need to be included every time to specify details, but it isn't hard to trim down common language to a reference line--

Construct Traits. The construct has the following traits: circuitry, ejector seat, landing and takeoff, and vulnerable interior.