Hello,

Thank you for contacting the World Warfare support team.

We are here to answer any questions or concerns you may have regarding loading troops into a transporter.
You want to first order your transport planes or ships to enter the Air Force Base or Naval Base if they are located outside. It may take you some time, so please be patient.
Next select your troops and click on the "Enter" button and select to choose the Air Force Base or Naval Base as a target. Please note that it will take some time for troops when you are loading troops into transporters within your base.

We do hope this information has been helpful and should you have any other questions then please do not hesitate to contact us and have a great day!