I'm in northern California.

For AMEX: charge or credit cards, always pull Experian only
For Citi: always pull Equifax only
For Chase: recently Chase pulled both Equifax & Experian for my Continental and Southwest applications. They used to just pull Equifax.

For Barclays, 10/19 applied for US Airways Business($79 annual fee one), pulled all 3 (EQ, EX and TU) on me! Approved after calling credit department (initially declined due to having a Biz card before).