2nd Experimental Flight Service
England - Australia 25th April, 1931
E 1-1, Karachi - Jodhpur
E 1-2, Karachi - Delhi
E 1-3, Karachi - Allahabad 
E 1-4, Karachi - Calcutta
31-50: Cover flown from London to Calcutta on the second experimental flight. Postmarked London, (faint date), and Park Street, Calcutta, Dely, 6 May 31, arrival stamp on verso along with Stephen Smith signature. Also on front is a violet handstamp, 2nd Experimental Flight, England ..... Australia, "City of Karachi".
E 1-5, Karachi - Akyab
E 1-6, Karachi - Rangoon
E 1-7, Karachi - Victoria Point
E 2-2, Jodhpur - Delhi
E 2-3, Jodhpur - Allahabad
E 2-4, Jodhpur - Calcutta
31-50: Cover flown from Jodhpur to Calcutta on the second experimental flight. Postmarked Aerodrome, Jodhpur, 4 May 31, and Park Street, Calcutta, Dely, 6 May 31, arrival stamp on verso along with Stephen Smith signature. Also on front and verso is a violet handstamp, 2nd Experimental Flight, England …. Australia, "City of Karachi".
E 2-5, Jodhpur - Akyab
E 2-6, Jodhpur - Rangoon
E 2-7, Jodhpur - Victoria Point
E 3-3, Delhi - Allahabad 
31-50: Cover flown from Delhi to Allahabad on the second experimental flight. Postmarked Delhi Cant., 3 May 31, and Allahabad G.P.O., Dely, 5 May 31,  and Allahabad G.P.O., Dep 5 May 31, arrival stamp on verso along with Stephen Smith signature. Also on front and verso is a violet handstamp, 2nd Experimental Flight, England …. Australia, "City of Karachi".
E 3-4, Delhi - Calcutta
31-50: Cover flown from Delhi to Calcutta on the second experimental flight. Postmarked Delhi Cant., 3 May 31, and Park Street, Calcutta, 6 May 31, arrival stamp on verso along with Stephen Smith signature. Also on front and verso is a violet handstamp, 2nd Experimental Flight, England …. Australia, "City of Karachi".
E 3-5, Delhi - Akyab
E 3-6, Delhi - Rangoon
E 3-7, Delhi - Victoria Point
E 4-4, Allahabad - Calcutta
E 4-5, Allahabad - Akyab
E 4-6, Allahabad - Rangoon
E 4-7, Allahabad - Victoria Point
E 5-5, Calcutta - Akyab
E 5-6, Calcutta - Rangoon
E 5-7, Calcutta - Victoria Point
E 6-6, Akyab - Rangoon
E 6-7, Akyab - Victoria Point
E 7-7, Rangoon - Victoria Point
31-50: 1931 (April) England to Australia flight by Kingsford Smith, Second experimental flight, envelope sent registered to Singapore franked Air 8a. tied by Rangoon datestamp, violet "2nd Experimental Flight by Southern Cross VH-USU, Pilot Commandar C. Kingsford Smith" cachet, franked "Unclaimed" handtamp, on reverse Singapore arrival cds of May 8.
W 1-1, Victoria Point - Rangoon
W 1-2, Victoria Point - Akyab
W 1-3, Victoria Point - Calcutta
W 1-4, Victoria Point - Allahabad
W 1-5, Victoria Point - Delhi
W 1-6, Victoria Point - Jodhpur
W 1-7, Victoria Point - Karachi
W 2-2, Rangoon - Akyab
W 2-3, Rangoon - Calcutta
31-55: Siemens Rangoon Cover flown from Rangoon to Calcutta on the second experimental flight. Postmarked Rangoon G.P.O., 21 May 31. Also on front is a green illustrated handstamp, Via the Air Trail Blazed by the Ross Smith and Cobham, 2nd Experimental Flight, Australia – England.
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W 2-4, Rangoon - Allahabad
W 2-5, Rangoon - Delhi
W 2-6, Rangoon - Jodhpur
W 2-7, Rangoon - Karachi
W 3-3, Akyab - Calcutta
31-55: Cover flown Akyab to Calcutta, and postmarked AKYAB, SORTING, 21 MAY 31, arrival mark PARK STREET, CALCUTTA, 25 MY 31.
W 3-4, Akyab - Allahabad
31-55: Cover flown Akyab to Allahabad, and postmarked AKYAB, SORTING, 21 MAY 31, arrival mark ALLAHABAD G.P.O. STREET, 26 MY 31.
W 3-5, Akyab - Delhi
W 3-6, Akyab - Jodhpur
W 3-7, Akyab - Karachi
W 4-4, Calcutta - Allahabad
31-55: Calcutta to Allahabad stage with an unrecorded cachet, and nothing on verso by Stephen H. Smith '61 carried'.
W 4-5, Calcutta - Delhi
W 4-6, Calcutta - Jodhpur
W 4-7, Calcutta - Karachi
31-40: The Aero Philatelic Club of Calcutta souvenir cover flown from Calcutta to England on 23 May 1931.
Postmarked Calcutta G.P.O. 23 May 31, and ads on verso Croydon Surrey 5 Ju 31.
W 5-5, Allahabd - Delhi
W 5-6, Allahabd - Jodhpur
W 5-7, Allahabd - Karachi
W 6-6, Delhi - Jodhpur
W 6-7, Delhi - Karachi
W 7-7, Jodhpur - Karachi