You also get to receive all the hotel and flight points for travel even if you use your corporate card. I personally got two nights free for a weeks worth of travel in london and that to me is worth calling a perk. I know so many other people who get ridiculous miles and points for rooms. Also, if you hold an Amex corporate card you can join their reward program for $90 a year and cash in on all the points you would get when you charge the card. It can be a very lucrative perk to have.
To answer the OP's question though yes travel is always expensed to your employer, you will rarely have to pay for it out of pocket unless you decide to stay an extra day or too beyond your assignment. Your return flight is still paid for though but you would have to cover cost of food and hotel stay like I did when I stayed an extra week in london. My $1,500 return flight was covered I just had to dish out money for hotel and food for that extended time.
They also provide pretty good discounts on gym memberships and I am pretty sure each B4 has their own website where you can shop around for discounts. Mine was called something like the “marketplace”. I got really good discounts on computer software like microsoft office when I bought my new laptop. Cost like $10 or something crazy like that. So definitely a lot of extra perks to come.
Just remember these perks come at the expense of your sanity as you are working 80 hours a week, the perks start to not really do much for you.
Edit: I am speaking about a B4 here not RSM, but I assume it is along the same lines.
AUD - 77
BEC - 82
FAR - 75
REG - 81
Illinois Certified Public Accountant 2016
AUD - 69, 77
REG - 74, 81
FAR - 75!
BEC - 71, 82
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Finally done (5/24/16)!! Yahooooooo!