It took a unique trimotor to deliver your Saturday Air Mail.
The Pander S.4 - known also as Postjager and Panderjager- was a very stylized Dutch trimotor designed by Theo Slot that first flew in 1933. It was built by the furniture company Pander & Zonen as a high speed mail plane, intended for East Indian service - a direct competition for KLM and their Fokker Pelikaan*.
A postcard deliverd by the Postjager from Amsterdam to Batavia. It arrived to Bandong onboard the Pelikaan
Only one was produced and after some mail flights (most notable - to Batavia in November-December, 1933) it entered the MacRobertson air race. After 36 hours of flight it was badly damaged on arrival at Allahabad, British India. When the aircraft was repaired and ready to leave, it crashed and went up in smoke. The accident had nothing to do with the plane or its pilots; it was a collision with a vehicle on the tarmac.
The Pander was equipped with three 450hp Wright Whirlwinds and retractable landing gear, its construction material being mostly wood, and its lines were advanced for its time. It sported flaps and “park bench” ailerons. Capacity was 500kg, range 2,430km, maximum speed 370 km/h, cruising speed 300 km/h (not bad for 1933).
* See an article (in Dutch)