Our itinerary for Sweden shows “ESSA” in the ops spreadsheet, but the booking portal uses a different three-letter code for Stockholm’s main airport. Before we lock cars and meeting times, I want a single, skimmable page that clearly identifies Stockholm Arlanda, keeps the code story straight for passengers vs. ops/trackers, and gives just enough traveler context (basic orientation + transfers) so first-timers don’t mix up fields. One definitive link to paste into our trip doc would save a dozen Slack pings.