In modern days, the   
airlines
 cost has become less expensive than before. Change to a genitive case
airline's
airlines'
While
 Linking Words
this
 phenomenon has Linking Words
a positive consequences
 Correct the article-noun agreement
positive consequences
a positive consequence
such
Linking Words
Change preposition
 as 
  transffering
 of knowledge Correct your spelling
 transferring
at
 any place around the world and increasing tourism, others feel that it is a bad situation because some Change preposition
to
countries
 will become overcrowded.
Less Use synonyms
costation
 for airlines Correct your spelling
constipation
it 
is a good and Correct pronoun usage
apply
a 
successful phenomenon.  Correct article usage
apply
This
 phenomenon leads to prosperity for  nations, the tourism has increased around the world  . Linking Words
For instance
, in the Linking Words
Netherlands
 the number of tourists increased in the Add a comma
,Netherlands
last
 10 years which leads to more profit and more Linking Words
incomes
. Fix the agreement mistake
income
Besides
, knowledge transformation has become much easier, like painting, and Linking Words
archtictures
. Correct your spelling
architecture
architectures
For example
, Arabic Linking Words
countries
 , like  Doupe built the highest touir when they saw evil touir in Parise .so if the airline's prices decline Use synonyms
the 
discovering Correct article usage
apply
of 
the knowledge of different nations will become easier and adopting the one you prefer will become easier .
Change preposition
apply
In contrast
 to,these positive impact there is a negative side Linking Words
on
 it  as many Change preposition
to
countries
 will be crowded. Use synonyms
As
 Correct your spelling
A
number
 of tourists will be increased so some Change the article
a number
the number
countries
 will suffer from traffic transportation, especially these Use synonyms
countries
 Use synonyms
that 
Correct word choice
apply
there
 roads are not well Replace the word
their
desigined
 but have many historical places to visit.  Correct your spelling
designed
For instance
, Egypt country is full of historical places to visit but their roads are not suitable to make transportation there easy.many Linking Words
citizen
 and tourists are Fix the agreement mistake
citizens
complaning
 Correct your spelling
complaining
from
 traffic congestion. 
In conclusion,   as Change preposition
about
any
 side there are drow backs and positive Change preposition
with any
side
 Fix the agreement mistake
sides
for
 loss cost airlines the drow backs are Change preposition
to
the 
crowded and Change the article
apply
the 
positive are more prosperity to  nations andChange the article
apply
Correct your spelling
 knowledge
knowldge
 transformationsCorrect your spelling
knowledge