<s>
Flight	B-Application
Simulation	I-Application
is	O
a	O
flight	B-Application
simulation	I-Application
program	O
written	O
by	O
Psion	B-Application
and	O
marketed	O
by	O
Sinclair	O
Research	O
for	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
and	O
ZX81	O
home	O
computers	O
.	O
</s>
<s>
In	O
the	O
United	O
States	O
,	O
Timex	O
Sinclair	O
marketed	O
the	O
ZX81	O
version	O
as	O
The	O
Flight	O
Simulator	O
for	O
the	O
American	O
version	O
of	O
the	O
ZX81	O
,	O
the	O
Timex	B-Device
Sinclair	I-Device
1000	I-Device
.	O
</s>
<s>
Popular	O
Computing	O
Weekly	O
said	O
"	O
No	O
words	O
can	O
do	O
justice	O
to	O
this	O
most	O
elegant	O
of	O
programs	O
...	O
You	O
will	O
not	O
see	O
a	O
better	O
computer	O
game	O
till	O
Psion	B-Application
produce	O
one	O
for	O
the	O
Spectrum	O
"	O
.	O
</s>
<s>
The	O
ZX	B-Operating_System
Spectrum	I-Operating_System
version	O
also	O
received	O
good	O
reviews	O
at	O
the	O
time	O
of	O
its	O
release	O
in	O
early	O
1983	O
.	O
</s>
<s>
Both	O
versions	O
of	O
Flight	B-Application
Simulation	I-Application
became	O
the	O
best	O
selling	O
program	O
for	O
their	O
respective	O
machines	O
with	O
the	O
ZX81	O
version	O
reaching	O
number	O
1	O
in	O
February	O
1983	O
and	O
the	O
Spectrum	O
version	O
reaching	O
the	O
top	O
of	O
the	O
Spectrum	O
charts	O
in	O
May	O
.	O
</s>
