As a S-6 as a S-16 types were bombers. The S-16 one was in production from 1926.
All metal- and welded steel-tube-airframe, fabric-covered, metal sheet plate cowling
Dimensions : span 15.30 m, length 10.22 m, empty weight 1400 kg
Poweplant : a 450 Lorraine Dietrich
Performance : Max. speed 230 km.p.h., service ceiling 6500 m, endurance 5 hrs 30 min 
Armament : Payload : up to 1000 kg, one synchronized and a twin-one firing rearwards for an observer.

An by Alois Smolik`s [shmolleek] designed Letov S-20 biplane was robust, but thanks to its aerodynamic smoothness the maximum speed of 256 km.p.h. was anticipated. The aircraft was in production from 1926 and used by the Czechoslovak Air Force as a production fighter plane.
Performance : Climb up to 5 00 m in 13 min 50 sec, service ceiling of 7200 m, range 528 km
Dimensions : span 9.70 m, length 7.44 m, empty weight 728 kg
Powerplant : a 300 hp Skoda HS 8 Fb

W/Cdr Jaroslav Skalka made a Tokio-bound long-distance flight via Moscow, Kazan, Omsk, Chita and Hedzhu in 1927 on this S - 16 machine. Heading for Czechoslovakia, he and his flight mechanic Taufer crashed in the Siberia region and took the plane`s rudder home.

A S-20 plane of the Olomouc Fighter Regiment. The originally designed fuselage touched the upper wing preventing pilots from seeing forwards properly. After their complaints the fuselage had to be lowered and redesigned, but still being of a robust design though of smooth aerodynamics. S-20 was later mass-built for Czechoslovak as well as for the Lithuanian Air Forces in the L version.
Steel-tube-framed fuselage as well as fin , rudder and elevator fabric-covered
Wood-framed wings covered by fabric, sheet metal plated cowling
Dimensions : Span 9.70 m, length 7.44 m, empty weight 728 kg
Powerplant : a 300 Hispano Suiza 8 Fb
Performance : Maximum speed 256 km.p.h., service ceiling 7200 m, range 528 km

Aero A-11.117 means the 117th machine of production. Equipped with exhaust-flame dampers for night-time flights.  The original A-11 version underwent several modifications not only in terms of its powerplant.

An Avia Ba-33 fighter plane of No 1 Fighter Regiment armed by two synchronized machine guns. Aircraft of this type was highly manouvrable. Turned out by the Avia Company from the year 1928 and later under licence in Poland.

An Avia Ba-33 fighter plane assigned to the No 1 Air Regiment at Cheb.
Wood-framed wings and fin partly covered by plywood and wholly by fabric
Steel-framed fuselage, rudder and elevator covered by fabric. Sheet metal plated cowling
Dimensions : span 8.9 m, lenght 7.04 m, empty weight 830 kg, loaded one of 1253 kg
Powerplant : a 450 Walter Jupiter Mk VI, two blade wooden propeller
Performance : Maximum speed 285 km.p.h., ratio of climb 10.5 mps, range 450 km
Armament : two synchronized machine guns.

Aero A-34W Blackbird. The original version of the Aero A 34 type was built in 1929 and powered by a 85 Walter Vega engine. Five years later came also sporting aircraft A-34 Blackbird into existence, but equipped by a 105 Walter Junior one. Used in Flying Clubs.
Wings : wood-framed covered by fabric, steel-framed fin, rudder, as well as tail-plane and elevator
Fuselage:steel-tube-welded frame combined with fabric-covered wooden skeletal structure
Dimensions : Span 8.7 m, length 7.1 m, empty weight 500 kg. Crew of two
Performance :  Top speed : 160 km.p.h., service ceiling 3000 m, range 320 km, climb 1500 m in 11 min 48 sec.

Letov S-31 powered by Walter Hornet engine / prototype/ Col. Josef Kalla stands front of the aircraft. Only three S-31 machines powered by a German-American 525 BMW Walter Hornet had been completed.
Dimensions : Span 9.8 m, length 7.15 m, empty weight 970 kg
Performance : Maximum speed 292 km.p.h., climb to 5000 m in 6 min 50 sec, range 450 kg and an extraordinary service ceiling of 10000 m !!!

 An 26 pcs batch of the Skoda D-1 fighter was built under the Dewoitine licence till 1929.
All-steel airframe, fuselage covered by sheet metal plates, wing by fabric. An out dated type late 20s, that reason for discharged by the Czechoslovak Army and used by the Police Air Patrol.
Span 12.24 m, length 7.64 m, powered by a 500 hp Skoda L engine
Performance : Top speed 270 km.p.h., ratio of climb 10m/p/s, service ceiling 9000 m, endurance : 1hr 30 min
Armament : two synchronized machine guns

The Aero A-42 bomber monoplane flown by Svozil made three International speed achievements in 1930 - 252.380 km.p.h.at a 1000 km distance loaded by 500 and 1000 kg respectively and 253.428 km.p.h. at the distance of 1000 km with no load.
 The machine was built by the Aero Company itself in 1930. Wooden wing, steel-tube-riveted fuselage covered by fabric. Sheet metal shaped engine cowling
A three-blade composite propeller powered by one 880 hp Isotta Fraschini Asso engine, but climb was inadequate and hold-off too long. Fixed undercarriage
Pilot`s complaints about poor view out of the cocpit covered by a canopy resulted in refinements that proved to be catastrophic in the second prototype.That reason for the Fokker F-IX type was preferred by the Defense Ministry and A-42 production aircraft was not realized.
Dimensions : Span : 20. 80 m, length 13.80 m, empty weight 2 940 kg
Top speed : 270 km.p.h, service ceiling 7000 m, range 1200 km