TAP is pruning back its network in the wake of large losses and the Portuguese government's decision to unwind the recent privatization. The MAN route appears to have survived but is being reduced to a single daily flight for the summer :-
TP322 LIS/MAN 1340/1630 Daily
TP323 MAN/LIS 1715/2005 Daily
Makes you wonder how TAP will fare if/when fuel prices rise
On a more positive note, in addition to AA upgrading JFK to 763 earlier from 04 March, DL is also upgrading their JFK flights to 763 on selected weekend dates in March (including a 767-400 on 5th and 26th !) before going daily 763 for the summer.