Trans - Africa Set - UpDraws ManyOfficials of Pan American Airways here announced Wednesdaythat 20 employes of various departments of the PAA western division headquarters at Brownsville airport have left for duty on the trans-Alrican airline which the company is establishing to ferry planes to British forces in the Middle East.Another man, employed by Eastern Air Lines, alro went from Brownsville, they said.Included in the PAA group areeight men from the maintenance department, nine men from theoperations department, two fromthe communications department andone from the accounting department.Men who have left here, by departments, are:Operations—W. E. McDawitt, Jr., F. A. St. Clair, W. R. McEtiannon, T. F. Austin. R. D. Parmley, L. H. Knowles, E. P. Whitney, D. C. Sewell and F. P. Glen.Maintenance—Bill Wersen* F. E. Anderson, E. A. Schema. H. K. Her-ridge, Harry Driver, Jimmie Cowan. Keith Feaster and Merlin R*sco. Communications—Jack Winn andR. Fife.Accounting—Santos Ceyanes.The Eastern Air Lines employe who signed up for serviae was George Lamer, officials said.