Low-cost airline Norwegian has received further expressions of interest after British Airways owner IAG acquired a 4.6% stake.
Shares in the Oslo-based carrier rose more than 10% after it announced "several inquiries" had been made.
It has created a steering committee to "review the situation, handle relevant inquiries and to safeguard the interests of all shareholders".
IAG said in a stock market announcement on April 12 that its stake was "intended to establish a position from which to initiate discussions with Norwegian", including the possibility of a full offer for the firm.
Norwegian has expanded rapidly in recent years, ordering dozens of aircraft to serve a raft of new routes.
The firm has shaken up the long-haul market by offering flights at knockdown prices.
Some of its most popular deals have included £99 flights from Edinburgh and Dublin to New York.
Norwegian's losses before interest and taxes deepened by 31% year-on-year in the first three months of the year, reaching 2.2 billion kroner (£199 million).
Revenues increased by a third over the period, to 7 billion kroner (£632 million).