Tango Unifrom
You said Delta only gets 24 hours in DXB. That is not true. The stews get 24 hours but the pilots get 48 hours. Also before George Bush unilaterally raised the pilot retirement age to 65 in Dec of 07 no pilot from any airline could fly in US airspace if he was over age 60. As for today no pilot over age 65 can fly in US airspace so the Aussie pilots when they hit age 65 have to fly domestic.
Also US airlines adhere to FAA Regs all the time no matter where they fly to.
24 hour layover has to be a typo but will watch this space.