Throughout 2023, the iconic X2 roller coaster at Six Flags Magic Mountain experienced several periods of significant downtime primarily due to mechanical issues and specialized maintenance required for its complex "4th Dimension" trains. Unlike standard coasters, X2 features seats that rotate 360 degrees independently of the track, which places immense stress on the gears, racks, and rotation mechanisms. These parts are custom-made and often have long lead times for manufacturing and shipping. In 2023, the park reportedly faced delays in receiving specific replacement parts for the rotation system, leading to an extended closure that frustrated many visitors. Additionally, the ride's age (having originally opened as 'X' in 2002 before its 2008 upgrade) means it requires more frequent and thorough structural inspections than newer attractions. While the park aims for high uptime, the safety standards for a ride that flips passengers head-over-heels while traveling at 76 mph are incredibly high, meaning even a minor sensor or gear discrepancy will result in the ride being "coded out" until a full repair and testing cycle can be completed by specialized technicians.
Miami International Airport (MIA) does not have a "post-security" train that connects all terminals, but it uses the MIA e Train and moving walkways to help passengers navigate its large footprint. The MIA e Train is a small automated people mover located in Concourse E that helps passengers reach the satellite gates. For travel between the North, Central, and South terminals, passengers must use a series of long moving walkways located on the third level "Skywalk." However, MIA is famous for the MIA Mover, an automated train located outside the secure area. The MIA Mover connects the main terminal building to the Miami Intermodal Center (MIC), where travelers can access the Rental Car Center, Metrorail, and Tri-Rail. This means that if you are connecting between different airlines in different terminals (e.g., moving from American Airlines in North Terminal to Delta in South Terminal), you will likely have to walk a significant distance or exit and re-enter security. Travelers should allow at least 15–20 minutes to walk between the far ends of the airport, as the layout is expansive and can be confusing for first-time visitors.