<s>
The	O
USAS	B-Application
application	B-Application
suite	O
is	O
a	O
series	O
of	O
diverse	O
and	O
relatively	O
complex	O
mainframe	B-Architecture
applications	O
written	O
for	O
the	O
Unisys	O
1100-series	O
,	O
2200-series	O
,	O
and	O
Clearpath	O
IX	O
environments	O
.	O
</s>
<s>
Older	O
USAS	B-Application
applications	O
such	O
as	O
USAS*RES	O
(	O
Reservations	O
System	O
)	O
or	O
USAS*FDC	O
(	O
Flight	O
Data	O
Control	O
)	O
were	O
written	O
originally	O
in	O
Fortran	B-Application
,	O
but	O
elements	O
of	O
various	O
applications	O
were	O
also	O
written	O
in	O
COBOL	B-Application
,	O
Unisys	O
1100/2200	O
assembly	B-Language
language	I-Language
(	O
ASM	O
or	O
MASM	B-Application
)	O
,	O
and	O
the	O
LINC	B-Language
4GL	I-Language
.	O
</s>
<s>
USAS	B-Application
application	B-Application
mainly	O
developed	O
for	O
Airlines	O
business	O
use	O
.	O
</s>
<s>
There	O
were	O
many	O
applications	O
in	O
USAS	B-Application
suite	O
.	O
</s>
<s>
Lufthansa	O
IT	O
systems	O
plays	O
a	O
major	O
role	O
in	O
developing	O
USAS	B-Application
suite	O
.	O
</s>
<s>
Most	O
(	O
if	O
not	O
all	O
)	O
USAS	B-Application
applications	O
are	O
written	O
as	O
text-based	O
online	O
transaction	O
systems	O
which	O
are	O
designed	O
for	O
low	O
overhead	O
and	O
fast	O
response	O
times	O
.	O
</s>
<s>
The	O
original	O
USAS	B-Application
applications	O
such	O
as	O
USAS*RES	O
(	O
Reservation	O
System	O
)	O
,	O
USAS*CGO	O
(	O
Cargo	O
Application	B-Application
)	O
was	O
written	O
in	O
the	O
early	O
70s	O
and	O
were	O
adapted	O
in	O
different	O
forms	O
in	O
varying	O
degrees	O
of	O
customization	O
.	O
</s>
<s>
With	O
recent	O
advancements	O
in	O
computing	O
technology	O
however	O
,	O
the	O
USAS	B-Application
line	O
of	O
products	O
is	O
slowly	O
diminishing	O
and	O
is	O
being	O
replaced	O
(	O
especially	O
in	O
the	O
Airline	O
industry	O
)	O
with	O
other	O
open	B-Application
source	I-Application
front-end	O
products	O
.	O
</s>
<s>
"	O
USAS	B-Application
"	O
was	O
originally	O
an	O
acronym	O
for	O
Univac	O
Standard	O
Airline	O
Systems	O
,	O
but	O
the	O
product	O
line	O
is	O
now	O
referred	O
to	O
simply	O
as	O
"	O
USAS	B-Application
"	O
.	O
</s>
