What is IONE3 and how does it different than DONE3? On a flight that I look, KIX LAX, it has I 1 and D 9 and when I try to book 2 people, it has only 1 seat.

The rule sheet does say IONE3 is booked into I class which is a lot more restrictive.

Also, the engine can't find any DFW ANC DFW for any date.