Today (26 July) sees the final stage of the Tour, from Sèvres to the Champs-Elysées.The CoA of Paris is too well known to be included here, but that of Issy-les-Moulineaux, one of thecommunes through which the cyclists will pass, is worth a look.
Issy was once plain Issy, but in 1893 added the name of a hamlet within its boundaries once famed for its windmills. In 1911 Issy was chosen as the site of the airfield for the departure of the Paris to Madrid Air Race, and became world-famous as the site of one of the worst aircraft disasters of the pioneering days.https://en.wikipedia.org/wiki/1911_Paris_to_Madrid_air_race
In 1919 Issy became the base for the luxury car company Avions Voisin, which had previously manufactured aircraft at a factory at Billancourt just across the river Seine. The small airport at Issy has been a heliport since as long ago as 1953.
The French blazon illustrates the risks of using modern charges: D'azur au filet en sautoir d'or cantonné en chef d'un aéroplane d'argent, en pointe et aux flancs de trois moulins à vent du même ouverts de sable.
"Un aéroplane" might just have been acceptable if the blazon was pre-WW1, but even then it would not have been clear whether the plane was to be depicted from above (as emblazoned above) or from the side (and then dexter or sinister, monoplane, biplane?). Thereafter one has the option of following the original emblazonment, guessing that the intention was to recall the days of pioneer aviation, or ... including whatever plane, in whatever attitude, one's fancy lights upon.