<s>
A	O
global	B-Application
distribution	I-Application
system	I-Application
(	O
GDS	O
)	O
is	O
a	O
computerised	O
network	O
system	O
owned	O
or	O
operated	O
by	O
a	O
company	O
that	O
enables	O
transactions	O
between	O
travel	O
industry	O
service	O
providers	O
,	O
mainly	O
airlines	O
,	O
hotels	O
,	O
car	O
rental	O
companies	O
,	O
and	O
travel	O
agencies	O
.	O
</s>
<s>
GDS	O
is	O
different	O
from	O
a	O
computer	B-Application
reservation	I-Application
system	I-Application
,	O
which	O
is	O
a	O
reservation	B-Application
system	I-Application
used	O
by	O
the	O
service	O
providers	O
(	O
also	O
known	O
as	O
vendors	O
)	O
.	O
</s>
<s>
Primary	O
customers	O
of	O
GDS	O
are	O
travel	O
agents	O
(	O
both	O
online	O
and	O
office-based	O
)	O
who	O
make	O
reservations	O
on	O
various	O
reservation	B-Application
systems	I-Application
run	O
by	O
the	O
vendors	O
.	O
</s>
<s>
GDS	O
holds	O
no	O
inventory	O
;	O
the	O
inventory	O
is	O
held	O
on	O
the	O
vendor	O
's	O
reservation	B-Application
system	I-Application
itself	O
.	O
</s>
<s>
For	O
example	O
,	O
when	O
a	O
travel	O
agency	O
requests	O
a	O
reservation	O
on	O
the	O
service	O
of	O
a	O
particular	O
airline	O
company	O
,	O
the	O
GDS	O
system	O
routes	O
the	O
request	O
to	O
the	O
appropriate	O
airline	O
's	O
computer	B-Application
reservations	I-Application
system	I-Application
.	O
</s>
<s>
Some	O
GDS	O
systems	O
also	O
have	O
a	O
dual-use	O
capability	O
for	O
hosting	O
multiple	O
computer	B-Application
reservation	I-Application
systems	I-Application
;	O
in	O
such	O
situations	O
functionally	O
the	O
computer	B-Application
reservations	I-Application
system	I-Application
and	O
the	O
GDS	O
partition	O
of	O
the	O
system	O
behave	O
as	O
if	O
they	O
were	O
separate	O
systems	O
.	O
</s>
<s>
Global	B-Application
distribution	I-Application
systems	I-Application
in	O
the	O
travel	O
industry	O
originated	O
from	O
a	O
traditional	O
legacy	O
business	O
model	O
that	O
existed	O
to	O
inter-operate	O
between	O
airline	O
vendors	O
and	O
travel	O
agents	O
.	O
</s>
<s>
Lufthansa	O
Group	O
announced	O
in	O
June	O
2015	O
that	O
it	O
was	O
imposing	O
an	O
additional	O
charge	O
of	O
€16	O
when	O
booking	O
through	O
an	O
external	O
global	B-Application
distribution	I-Application
system	I-Application
rather	O
than	O
their	O
own	O
systems	O
.	O
</s>
