Lufthansa joins Emirates in calls for airlines summit on MH17

BERLIN (Reuters) - Lufthansa , Europe's largest airline by revenue, joined rival Emirates in calling for an airline summit to discuss the industry's response to the downing of an airliner over Ukraine, saying international security protocols should be reviewed.

Since Malaysia Airlines flight MH17 was shot down last week, questions have been raised as to why passenger planes were flying over a region hit by fighting.