Three Daughters, Three Cryptic Ads, One Happy Mother

The first one gets married and the second day the letter arrives with a single message, simply:
“MAXWELL COFFEE HOUSE”
Mother was very confused and finally noticed a Maxwell Advert, and it said:
“Satisfaction to the last drop…” So, Mother was happy.

Then the second daughter got married. After a week, there was a message that read:
“ROTHMANS”
So, the Mother looked at a Rothmans ad, and it said:
“LIFE SIZE, KING SIZE” And Mother was happy.

Then it the third one got married. Mother was anxious. After four weeks came the message:
“BRITISH AIRWAYS”
So mother looked at the BA ad, but this time she fainted. The ad read:
“TWO TIMES A DAY, FOUR TIMES A WEEK, BOTH WAYS.”