Requires:

{
  "obstaclesCleared": [
    "A"
  ]
}

Exit condition:

{
  "leaveWithRunway": {
    "length": 1,
    "openEnd": 1
  }
}

Unlocks doors:

{"types":["super"],"requires":[]}
{"types":["missiles","powerbomb"],"requires":["never"]}

Dev note: FIXME: Add acid-filled version of the runway, and requirements to unlock the door with Missiles and Power Bombs.