Word of warning re: Scenic Air:
Not only were we unimpressed (for similar reasons as D&W - nobody there, not set up, tour not as promised), we were also dumped on the rim with no facilities, food, water, or any other human being for over 1 hour in the boiling heat while the bus disappeared to get the next party. If something had happened, we could have done nothing - no phones work at the Canyon either.
Their fuel "surcharge" has now increased to $20 per passenger, too.