Walsh said it is important infrastructure providers are prepared for a "huge increase" in passenger numbers in the coming months.
"We are already seeing reports of unacceptably long queues at some airports owing to the growing number of travellers," he added. "And that is even before the surge of Easter holiday travel in many markets next week.
"The peak northern summer travel season will be critical for jobs throughout the travel and tourism value chain. Now is the time to prepare."
Walsh urged governments to ensure border positions are "staffed adequately" and background security checks for new staff are "managed as efficiently as possible".
