Good to see Qantas ahead of the pack but Haneda already served by following carriers:
ANA
JAL
AirAsiaX
Air Canada
Air China
Air France
American
Asiana
British Airways
Cathay Pacific
China Airlines
Chine Eastern
Delta
Emirates
Eva
Garuda
Hawaiian
HK Express
Korean
Lufthansa
Philippine Airlines
Qatar
Shanghai Airlines
Singapore Airlines
Thai Airways
United
Vietnam Airlines
Many of these carriers operating double daily.
Cathay has two a day out of Haneda and 5 a day out of Narita and it works fine. Most airlines charge a little more out of Haneda than they do for the same city pairings ex-Narita.