The answer is absolutely not. An aircraft impacting the water is no more a "vessel" under maritime law than a boat lifted out of the water by a cyclone or tornado becomes an aircraft . . .
WillFlyForCheese, under U.S. admiralty law, a seaplane is a vessel, and a seaplane retrieved from the open sea, mid-Atlantic, by a trans-oceanic liner and brought to England was a 'vessel' subject to admiralty law.
A crashed plane, at the bottom of the sea, is subject to admiralty law.
INTERNATIONAL AIRCRAFT RECOVERY, L.L.C., a Nevada Limited Liability Company, Plaintiff-Counter-Defendant-Appellee,
versus
THE UNIDENTIFIED, WRECKED AND ABANDONED AIRCRAFT, her armament, apparel, and cargo located within one marine league of a point located at 25-00043'34" N Latitude and 80-2'8" W Longitude,
Defendant,
UNITED STATES OF AMERICA