Table:
text: Eddie Rickenbacker
Verified aerial victories
Verified aerial victories
Number_ Time_ Aircraft Opponent Location_
15 1740 SPAD XIII Fokker D.VII Vilosnes
16 1707 SPAD XIII Balloon Dannevoux
17 1640 SPAD XIII Fokker D.VII Cléry-le-Grand
18 1752 SPAD XIII Fokker D.VII Dun-sur-Meuse
19 1552 SPAD XIII Fokker D.VII Cléry-le-Petit
20 1552 SPAD XIII Fokker D.VII Cléry-le-Petit
21 1555 SPAD XIII Fokker D.VII Cléry-le-Petit
22 1655 SPAD XIII Fokker D.VII Grande Carne Ferme
23 1505 SPAD XIII Fokker D.VII Bois de Money
24 1450 SPAD XIII Fokker D.VII Grand Pre
25 1635 SPAD XIII Balloon St. Juvin
26 1040 SPAD XIII Balloon Remonville

Question: What is Eddie Rickenbacker's highest time at number 21?