US Festival/Live Aid. Why no Journey?

After watching the US Festival Saturday and Live Aid on Sunday on VH1 Classic(love that channel), why wasn't Journey on these huge shows?
The US Festival was in 1983 and there wasn't a bigger band in the world at that time. Maybe they were on the Frontiers tour? Someone will probably know about that.
Live Aid was 1985 and that was probably during the "changeover" right before Raised on Radio began.
Surely Journey would have been asked to do these 2 huge, huge shows. They were at the peak of their success at these times. Does anyone remember details about why they didn't play? Would have been great.
The US Festival was in 1983 and there wasn't a bigger band in the world at that time. Maybe they were on the Frontiers tour? Someone will probably know about that.
Live Aid was 1985 and that was probably during the "changeover" right before Raised on Radio began.
Surely Journey would have been asked to do these 2 huge, huge shows. They were at the peak of their success at these times. Does anyone remember details about why they didn't play? Would have been great.