Are the lockers at McCarron operational? If so, will they handle a standard rollaway? I have an "planned" 9 hour layover in LAS, [PHL-LAS-SAN] and would rather not check (and likely lose) my bag in PHL, but I certainly don't want to cart it around LAS. As a follow-up question, would I be allowed to carry on my bag in PHL, then check it once I get in Vegas? (arriving 2:25 pm, leaving for SAN at midnight)