June March Macon group Texas world stops route Dallas summer Monroe airline Atlanta Georgia October company Jackson history trustee December Louisiana first CEO Fort Worth Shreveport cotton crops C.E. Woolman general manager Delta Air Lines airmail contract Delta Air Service Passenger service Huff-Daland Duster crop-dusting assets Passenger operations Delta Air Corporation other local investors first true crop duster boll weevil infestation Mississippi Delta region Local banker Travis Oliver first aerial crop dusting operation