Shares in British low-cost carrier ‌easyJet jumped as much as 11.4% on Monday after the airline agreed in principle to a 5.5 billion-pound ($7.34-billion) takeover bid from Castlelake over the weekend, but investors worried the deal might struggle to secure approval.

EasyJet said on Sunday it was prepared ​to accept U.S. investment firm Castlelake's sweetened bid of 6.90 pounds a piece, potentially ending lengthy negotiations and reshaping Europe's aviation industry.

The bid was ​a nearly 24% premium to easyJet's close on Friday, and around the 7 pounds price some investors were reportedly holding ⁠out for after four previous Castlelake proposals were rejected.

EasyJet, which rose to as much as 6.22 pounds on Monday, was up ​9.7% at 6.12 pounds as of 07:48 a.m. GMT.

A shareholder who declined to be named noted that current levels indicated the market ​was pricing a more than 30% probability of the deal falling through.