Air New Zealand has introduced special fare flexibility following the rescheduling of Elton John's Auckland concert from Tuesday to Wednesday.
"As a gesture of goodwill, Air New Zealand is offering customers affected by this change the opportunity to defer travel plans by one day without cost by calling its contact centre," the airline said in a statement.
The airline will waive any service fees or fare difference associated with moving the booking.
Customers who no longer wish to travel can also choose to hold the value of their fare in credit for up to 12 months.
Delays are possible for those calling the contact centre as it deals with an increased number of calls due to the concert changing date.
On Monday, it was confirmed that Elton John's concert scheduled for Tuesday night would be postponed by a day due to the superstar falling ill over the weekend.
Elton powered through nearly two hours of his Farewell Yellow Brick Road show on Sunday night, but had to finish the show early.
In tears, he apologised to the massive Auckland crowd.
"I've just completely lost my voice - I'm so sorry," he said.
Later that night he posted on social media saying he "gave it all I had".
"I was diagnosed with walking pneumonia earlier today [Sunday], but I was determined to give you the best show humanly possible," he said in an Instagram post after the concert.
"I played and sang my heart out until my voice could sing no more."