<form [formGroup]="planesFormGroup" (ngSubmit)="cachePlanes()" class="mb-2">
  <h4 class="pt-2 border-top">
    Planes
  </h4>

  <div class="w-100" *ngFor="let plane of getPlaneKeys()">
    <label><input type="checkbox" [formControlName]="plane" value="{{plane}}" checked/>{{plane}}</label>
  </div>

  <button type="submit" class="btn btn-sm btn-outline-info bg-light">
    Cache Planes
  </button>
</form>