China Tourism Academy said the domestic trips would drop 15.5% and outbound trips fall 17.6% in 2020.
In total, airlines in the Asia Pacific region are set to see a $27.8 billion revenue loss in 2020.
Accor, Four Seasons, Hyatt, Hilton, IHG and Marriott offered to waive cancellation or booking modification fees.
The suspension does not affect existing bookings for mainland China made before the stop-sell measures were implemented.
Caissa Tourism reported revenue decline of 14.2% in the first three quarters of 2019, to RMB5.95 billion.
Air France-KLM warned of a €150-million to €200-million hit to earnings by April; Asia Pacific airlines could lose $27.8 billion due to outbreak.
China may see losses of USD 430 billion by the coronavirus disruption on travel for 2020; It plans cash injections and mergers to bail out aviation.
Tourism accounts for 11.8 percent of Malaysia's GDP, with 28 million arrivals last year, 11 percent of them from China.
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