N720H finally bit the dust in Phoenix, this was one of the last airworthy B720 msn 18384 bulit in 1961 started life with TWA and ended up being Honeywells Engines and Systems Flight Test aircraft....Sad to see her being broken up...pics here
Honeywell have replaced the B720 with a B757, N757WH msn 22194 ex G-JALC My Travel
The only other airworth example is the PWC test bed flown out of Montreal C-FETB


He who laughs last obviously has'nt heard the bad news.