LaunchTime (iPhone)

1. Tap top-right Filter Launches button

2. Change selection to match screenshot

Filter list I use for Spaceports/Rocket Launch Sites.

Calendar (iPhone preinstalled app)

1. Tap Calendars → tap SHOW ALL → tap HIDE ALL → tap tick in circle next to LaunchTime → tap Done

2. Zoom into Calendar day view if not already selected

3. Tap •— × 3 button at top-right if not already selected (this makes iPhone Calendar in general much more useful IMO—why this isn't the default iPhone Calendar view I don't know…)

This step will visually confirm the step 2 export of the list of upcoming rocket launch events from the list in LaunchTime, imported to the LaunchTime calendar in Calendar.

Countdowns (iPhone)

1. Tap Settings

2. Change selections to Settings (1st screenshot)

3. Tap Defaults

4. Change selections to Defaults (2nd screenshot)

My recommended Countdowns app Settings & Defaults (for new Countdowns events).

Countdowns (iPhone)

1. Tap + → Tap Import from Calendar → Tap LaunchTime

2. Tap < and/or > buttons at bottom to select month of rocket launch

3. Tap each listed launch

4. Tap Done

This step will export the list of upcoming rocket launch events from the LaunchTime calendar in Calendar, and import the list to the LaunchTime list in Countdowns.