Hello ConradNordquist,
Charging an iPad Pro 11-inch (4th generation) using a 5V, 2.5W USB 1.x outlet may not provide sufficient power to charge the device effectively. The iPad Pro requires a higher-power charging source to charge optimally.
The 4th generation iPad Pro models support USB-C charging, which allows for faster charging when using a compatible charger. To ensure the best charging experience for your iPad Pro, it's recommended to use a charger that meets the power requirements of the device.
The iPad Pro (4th generation) supports USB-C Power Delivery (PD), which can deliver up to 30W, 36W, 61W, or 96W of power depending on the charger you use. To take full advantage of the fast-charging capabilities, it's recommended to use an Apple USB-C power adapter with a USB-C to USB-C cable.
If you're in a situation where you only have access to the 5V, 2.5W USB 1.x outlet in your plane, you can still charge your iPad Pro, but it may take longer to reach a full charge, and the charging speed may be slower compared to using a higher-power charger.
Keep in mind that using a low-power charger may not provide enough power to charge your iPad Pro while it's in use, especially if you're running demanding apps or performing tasks that consume a lot of power.
If you frequently need to charge your iPad Pro in your plane, you may want to consider investing in a USB-C car charger or an airplane power adapter that supports higher-power charging, which will provide a more efficient and faster charging experience for your device.
I hope this information helps. If you have any further questions, feel free to ask.
