Here is the list of pilots at Jasta 11 in April from Rick D. research.
Pilots in April
Staffelführer..................................Victories....... From...............To
................................................Js ...Ttl...Unit.....Date.....Date.....Unit
Ltn. Karl W. Effers........................0....0.............. ...Jan17...13Jun18...AFP 17
Ltn.d.R.
Erich Just........................6....6...............1 Mar18.....3May18...WIA
Oblt. Walther Karjus......................0...1..JSch II...26Mar18....29May18..AFP 2
Ltn. Wolfram Frhr. von Richthofen....8....8..JsSch I..27Mar18.....1Aug18
Ltn.d.R. Edgar Scholtz...................5....6..BG 2/10..11Mar18....2May18...KIC
Ltn. Werner Steinhäuser................9...10..Hosp........2Ap r18....26Jun18...KIA
Ltn.d.R.
Hans Weiss......................5...18..Js 10.......1Apr18.....2May18 KIA
Ltn.d.R.
Richard Wenzl...................0...11..Js 31.....27Mar18...15May18...Js 6
Ltn. Joachim Adolf Wolff................10...10...............3Feb18. ..16May18...KIA
Ritt. Manfred Frhr. von Richthofen...64...80..Leave...16Feb18.....21Apr18. ..KIA
Pilots available in April but not on April 21
Uffz. Robert Eiserbeck...................0....0................ .Apr18....12Apr18.....KIA
Ltn.d.R.
Siegfried Gussmann...........4....5..JsSch I....29Oct17....7Apr18..WIA,lt.
Ltn.d.R.
Ernst Udet.......................3....62..Js 37....18Mar18....8Apr18...Hosp.
Robert Eiserbeck...........................0....0........ .........Apr18....12Apr18...KIA
Oblt. Erich Rüdiger von Wedel........13...13...............23Apr18...EOW
This list then shows that ten pilots were there for that whole month of April and five other pilots we're either KIA, WIA or just arriving.
I thought that there would have been 12 pilots with at lest one or two in reserve. This would be a question for Dan-San to shed some light on this if this is accurate.
Now the next part of the question is to match up the names to the available planes.
Lloyd...