BRUSSELS, March 6 (Reuters) - Lobbying groups

representing airlines, hotels and restaurants on Wednesday

warned that changes proposed by Alphabet's Google to

comply with EU landmark rules may drive users to large online

search services at their expense.

The comments from Airlines for Europe group that has Air

France KLM and British Airways owner IAG as

members, hotel group Hotrec, European Hotel Forum, Eurocommerce,

Ecommerce Europe and Independent Retail Europe came after Google

rolled out changes for app developers and users.

Google together with five other tech giants have to be fully

compliant with a list of dos and don'ts set out under the

Digital Markets Act (DMA) on March 7.

"It should not lead to situations where the economic power

of large online intermediaries is further entrenched and where

consumers are not presented with a variety of choices," the

groups said in a joint statement about the planned changes.

Some of the companies could lose as much as 50% of their

online traffic and possibly millions of euros in revenues due to

Google's changes to its search results, people with direct

knowledge of the matter said.

Google declined to comment. In its blogpost on Monday, it

said changes to search results give large intermediaries and

aggregators more traffic and less for hotels, airlines,

merchants and restaurants.

Lobbying group eu travel tech which counts Amadeus ,

Booking.com, Expedia ( EXPE ) and Airbnb ( ABNB ) as its

members, in turn criticised Google for allegedly continuing to

favour its products over rivals despite DMA rules seeking to

rectify that.

"Google continues to self-preference its own intermediation

services on the search engine results page. In travel search,

this includes the display of Google's comparison products for

Hotels, Flights, Things to do, Trains and Vacation rentals with

units that are more prominent, interactive and rich than any

other search result," they said in a joint statement.