28 CFR Part 36 Nondiscrimination on the Basis of Disability by Public Accommodations and in Commercial Facilities NPRM (2008 Title III NPRM)

(9) Purchasing multiple tickets. 

(i) Individuals with disabilities and their companions shall be permitted to purchase the same maximum number of tickets for an event per sales transaction as other spectators seeking to purchase seats for the same  event.  If there is an insufficient number of seats for all members of a party to sit together, seats shall be provided that are as close as possible to the wheelchair spaces.  For accessible seating in a designated wheelchair area, a public accommodation shall provide up to three companion seats for each person with a disability who requires a wheelchair space, provided that at the time of purchase there are sufficient available wheelchair spaces. 

(ii) For group sales, if a group includes one or more individuals who use a wheelchair, the group shall be placed in a seating area that includes wheelchair spaces so that, if possible, the group can sit together.  If it is necessary to divide the group, it should be divided so that the individuals in the group who use wheelchairs are not isolated from their group.