Originally Posted by mia

Personal Platinum Card has, essentially, its own comprehensive website...

https://www124.americanexpress.com/c...?page=platinum

Information about Business Platinum is diffused. You have probably seen this summary...

http://www201.americanexpress.com/sb...mp=1&eep=20006

...which omits mention of the International Airline Companion program, but there is also this page...

http://www133.americanexpress.com/os...CR001_Home.asp

Click [Travel] to see more...

http://www133.americanexpress.com/os...avel_head_main

However, make sure you search for discussions of this benefit before giving it weight in your decision.