BA cabin crew could strike again over Christmas

The transcript discusses a union rally at Kempton Racetrack concerning a long-standing dispute with British Airways. The union is considering further strike action, especially around Christmas, due to unresolved issues including changes to working practices and the dismissal of staff. Past strikes have caused significant disruption and financial loss to the airline. British Airways claims to be better prepared for any future strikes, while the union remains determined to fight for their demands.

How many days of industrial action have occurred so far according to the text?

What is the main issue that the dispute has evolved into beyond working practices?