A Spanish court made the ruling after a passenger was forced to pay a fine for extra luggage.
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Ryanair has been rated worst for customer service out of 100 big British brands, according to Which?.
The airline says the routes between Ireland and the US are no longer "commercially viable".
The row is over pay and conditions, with the pilots' union announcing plans for two walkouts.
The airline says it is seeing weaker demand for tickets in the second half of the year.
After going bust on Thursday, Icelandic budget carrier Wow Air left passengers stranded across two continents.
The airline's collapse follows a string of European failures as a perfect storm hits the industry.
The Berlin-based carrier transported more than four million passengers a year.
Turkmenistan Airlines has been grounded after Europe's air regulator suspended permission for it to fly.
The budget airline's shares sink 16% as it plans to raise extra money to improve its finances.